I've noticed a couple issues that really need worked out.
1. On an iPhone in landscape, everything gets crammed into the left half of the screen, instead of utilizing the whole thing. Rotating to portrait and back to landscape fixes it, so this could be an iPhone issue rather than a site issue.
2. Clicking the 'view the regular page' and 'turn off the mobile site permanently' links give 404 errors, and thusly don't work at all. I've not checked yet, but I do hope you've included a way to turn it back on if it does get disabled :)
3. The links to show or hide sections of text seem of limited usefulness to me. If used as a bandwidth saving device, i.e. by loading the hidden text only when the button is clicked, I could see a lot more use for them.
Overall, I like it. Not nearly as annoying as several other mobile sites, especially if external links redirect directly to the mobile version of the linked page, rather than just to the default mobile site. I also enjoy the lack of frivolous links on the left side as are on the regular site. You're currently at an A-, fixing the first two issues I mentioned will bring you to an A :P. Good job.
Z. Ware
Sent from my iPhone