Let the hive mind of Engadget get that for you.
"I own an iPhone 3G and I'm looking for a decent speaker / alarm clock for it. I am going to listen music in a mid-sized room, so I want nice quality speakers with solid bass. I also want to use it as an alarm clock, so it would be great if there is such a feature. The price can be low-mid to mid-high range. I was looking at the Klipsch iGroove SXT; it's powerful, slick and the reviews are good, but it doesn't have an alarm clock feature. It's no deal breaker if I can set it up from the iPhone, but I'm not sure. Thanks!"
The $25 plan limits "messages" to 400. Web access is unlimited.
"Messages" are defined as "text, picture, video and IM". So I'm guessing that the IMs you send and receive in this GMail app are indeed metered. :-(
But what happens if you access the web-based GMail through the web browser? Will IM be metered there, too?
Hopefully email messages are not metered. Although they are "messages" in the generic sense, they aren't explictly included in the above definition.
I've been using a Treo for years on T-Mobile, where $6/month ($72/year) enables unlimited web, email (Chatter), and IM (Toccer). To get that on the G1 costs $420/year. Granted, the G1 does a whole lot more, but if 90% of the utility is in the first $72, the extra $348 only adds 10%, it's not so compelling an upgrade.
My guess is that that's a bug in the checkout code, and if you try to take advantage of it, something unpleasant will happen in the future, such as letter from T-Mobile saying "sorry, we couldn't deliver your G1 because you didn't select a data plan". But who knows?