I'm using the 2010 11" as my primary computer, and have been really happy with it. But then again, I mostly hack CoffeeScript and PHP with vim on Linux, so how much power do I need ;-)
Just built-in, and no external mouse or keyboard either. I want my working environment to be the same regardless of whether I'm at the office or in an airplane
http://bergie.iki.fi/blog/11-macbook_air-the_best_computer_i...