The one I'm really eyeballing is the Asus EeePad Transformer, which is on special at Newegg... http://www.newegg.com/Product/ComboDeal ... mbo.718525 My friend bought this combo last month for the full price, so this is a decent discount. One plus is it's an Android tablet, so there's a large hacker community behind it. A large negative is the presence of only 1gb of DDR2 RAM. Another such negative is the capacitive touch screen; I don't know when stylii became the bane of tablet makers everywhere, but I blame Steve Jobs. :<
Whatever I do get is going to get some flavor of Linux slapped onto it. Asus makes some AMD-based netbooks as well, cheaper and more versatile than the Transformer, but also bigger, more of a power hog, lacking touch screens, and not modular. I'm pretty fond of Asus, as you might tell; they've been in the netbook game from the very beginning with their Eee PCs, the first batch running XP with a paltry 512mb RAM and an 8gb SSD.
I just don't wanna buy something then never use it, too. Arguably speaking, wherever I am that I need to work (home, school) there will be a desktop computer I have access to.

Anybody bought a laptop/netbook recently for under US$600 and been really impressed with it?