It's been under the rumor banner for some time now, but we've been told by a trusted source that the long-awaited AT&T iPhone-as-modem tethering plans (preliminary details in MacBlogz' post from November: 5 GB data cap, $30/month supplementary cost) may be ready for prime time during Macworld Expo this week. The tethering announcement might not rise to a keynote-worthy level; it could simply be publicized as a press release during the show.

While $30 is a steep charge on top of an iPhone data plan, it's still cheaper than the $60 you'd pay for an EV-DO or HSDPA card plan for mobile data; for some users it may make more sense than a standalone device. Granted, you can already tether a jailbroken iPhone, but that may get you stomped on by the traffic cops rather promptly.

Another tidbit from our source lends credence to the MegiPod rumor (a larger form factor for an iPod touch device) floated by TechCrunch last week. No timeframes were discussed, so the late 2009 on-sale date is still in play. It's not clear how the hypothetical unit would achieve this feat, but the suggestion is that it would have "full application compatibility" with currently available iPod touch apps ... puzzling, as it implies either resolution-independence for the apps or some pretty impressive scaling tricks to accommodate the larger screen size.

Microsoft's share of the operating system market is dropping, while Apple computers and handhelds have topped 10 percent for the first time, according to a new report on Internet-connected computers.

NetApplications, the company that tracks browser and operating system market share for a variety of sites across the Internet, released its data for December 2008. According to a Computerworld analysis, the number of Windows users decreased in December by 0.94 percent to 88.7 percent.

The fall was the steepest in four years since Net Applications began collecting data, and was also more than twice that of any similar period in the previous three years. The Computerworld article does note that December statistics do slant slightly towards the Mac due to the reduced number of in-office days for corporate users, but the overall shift is decidedly Mac-ward even once that's accounted for.

Apple's share is just over 10 percent, if one combines the market share for both Macs and iPhones. Macs account for 9.63 percent of computers online. (Windows Mobile devices are included in the 88.7 percent figure.)

Also of note, almost three quarters of Macs online have an Intel processor. This time last year, less than half had one. Overall, Mac OS X's share grew by 31.7 percent compared to a year ago.

Windows XP remains the operating system with the largest installed base, with over 65 percent of the market.

This is a big duh to anyone (like me) who's switched to a smartphone within the last year or so, but according to "new research" (I've never heard of them either), social networking applications and websites are blowing up on mobile phones, including none other than the iPhone.

Things are going both ways -- social networks are reaching out to mobile users with mobile versions of their sites and device-specific applications, and mobile phones are reaching back by allowing quick and easy ways to take pictures or upload text or video. That dude on his phone in the bar next to you is just as likely to be texting his entire network as he is texting that friend he's waiting for.

The end of The Guardian's article about this notes that search is up on mobile phones, too. Throw one more tick on the list of ways the iPhone has influenced how, when, and where we're using the Internet on our phones.

[via textually]

• Check Twitter immediately before going to bed? Possibly while in bed? From multiple devices?
  
• Have a stagnant blog, but a bulging Twitter stream?
• Stare at the display for hours at a time so as not to miss a landmark follower or tweet (like #500)?
• Added his or her Twitter handle to business cards, web sites, etc?

• Twitterrific (Desktop) - Free ad-supported version, $14.95US premium version
• Twitterrific (iPhone/iPod touch) - Free ad-supported version, $9.95US premium version
• TweetDeck - Free
• Tweetsville - $3.99US
  
• Twinkle - Free
  

• Dictionary of Concise Writing - $14.95US at Amazon
• Webster's New World Thesaurus - $14.95US at Amazon

• Swipe Left/Right to move backward/forward through browsing history
• Swipe Up/Down to move to top/bottom of web page
• Pinch in/out to make the text larger or smaller
• Twist left/right to move between open tabs

According to Mac OS X Hints, if you're trying to send an email to someone with a spamcop.net email address with your MobileMe account, chances are the message will never arrive, and you won't be notified.

What's worse, apparently if you're sending the message to a distribution list, and only one of those recipients has an address at spamcop.net, nobody will receive the message.

Apparently the problem has been happening for months, since Apple moved everyone from .Mac to MobileMe. A participant in the Apple Discussions thread notes that it's common for service providers to filter their outgoing mail by domain in order to avoid being blacklisted. So far, only spamcop.net appears to be affected.

A workaround for now would be to try to send the message using a different email account. We'll let you know if Apple offers a fix in the meantime.

Update: Friendly reader Jason sent me a detailed explanation about why this might be. In a misguided attempt to control their individual load of spam, some users choose to forward all their MobileMe mail to a spamcop.net address. Spamcop, unfortunately, thinks the "spam" originated at MobileMe, not the actual origin of the spammy badness. So, MobileMe, to combat this, forbids forwarding to domains like Spamcop in order to avoid being blacklisted. There's nothing sinister going on here, just honest network administrators doing what they can with what they've got. Thanks, Jason!