Daring Fireball's John Gruber posted the following last night:

A decade ago, my first PowerBook was a secondary machine to the desktop anchored at my desk. Now, my main machine is my MacBook Pro, but it feels a bit like an anchor now. My mobile secondary computer is my iPhone

A couple of friends of mine who work in IT administration have been telling me the same thing since the iPhone 3G launched. One of them recently left his laptop behind and took only an iPhone with him on a motorcycle trip and conference, and was still able to keep on top of his servers.

While the sheer volume of writing and editing demanded by TiPb still keeps me chained to a laptop, I'll also admit to leaving the MacBook behind and running out with only my iPhone whenever I can -- and yes, I've been likewise amazed at not only how much I can now accomplish with a mobile computing device, but how easily I can accomplish it.

Have you been using your iPhone as a laptop replacement? How does it fit your work needs, and what have your results been so far?

Back in November Dieter told us about the Evil Empires (AT&T) plan to drain another $30 from all of it's iPhone owners if they wanted to tether with a laptop. Well according to TUAW this may be the week you have all been waiting for.

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.

So what will you get for your $30 a month??? 5 GB data cap... A bit steep don't you think? Then again would you expect anything else from AT&T? I know the few times I would actually be tethering, I'd willing to take that risk on the Jailbroken app. Are you willing to pay that much for this service or are you more willing to Jailbreak your iPhone 3G and roll the dice with a program such as PdaNet?

Sound off in the comments!

[Via TUAW]