I have a 13" MBA of the previous (Core2) generation - very happy with it. I bike commute so the small size & weight were important, and the OSX development environment for Ruby is fairly well evolved. Jeff Atwood has already flogged the benefits of SSD, and I'm a big fan as well - but whatever size suits your data makes sense, I wouldn't over-buy just for the i7 option. The difference between i5 and i7 usually only shows up in very specific workloads that take advantage of the i7's hyperthreading or clock bump. For general development work you won't see a difference, although both i5 and i7 are substantially faster than the Core2.
I agree with jakecarpenter, leave out the URL plug - interested parties can Google. I'd also drop the "Briefly," from the front end, it weakens the whole phrase. The actual length of the pitch speaks for its own brevity.
Interested parties have better things to do with their time than fix the bugs you introduced into your own elevator pitch. Lack of a prominent call to action is a bug, not a feature.
Give them a link front and center. (I would personally link to a specially prepared landing page, not the front page. If they've demonstrated enough interest to click then they just might be interested in stepping through a brief guided tour.)
