In the market for a new budget ultraportable notebook? In a way, I pity you: the burgeoning niche seemingly has new entrants every day, and a decision which once was "either cheap Eee or expensive Sony" now has multiple contenders. Liliputing know a thing or two about compact computers, and they've decided to throw us all a lifeline; their run-down of the latest & pre-release models should hopefully help you tell the difference between a Cloud and a Wind.
Some of the choice will be forced on you by virtue of where you're located. Liliputing include models available all over the world, so you may find that, say, Blue Digital Systems' "Deep Blue" Eee-clone would be a whole lot harder to get hold of than the ASUS original. Unless you live in the Philippines.
You can check out our previous coverage of some of the ultraportable & budget options by hitting the ultraportabletag. That also includes the higher-end models, such as Apple's MacBook Air and Lenovo's ThinkPad X300. I'd be interested in hearing which ultraportable you're leaning toward if you plan on splashing the cash, so let me know in the comments.