I was looking for a while for something small, fast, and with some decent space. Finally found this:

160GB, 2 MB buffer, 5400 RPM, USB2.0, and it is powered via the same USB cable. NICE! 7.2 x 6.3 x 3 inches ; 3.7 ounces, it is about the size of a Nintendo DS Lite. NICE! They just came out with a 250GB version.

I highly rec'd this if you travel and are on the road frequently. I converted the partition to EXT3 for my Ubuntu linux laptop and do my Liferay builds on it often. Portal Source 'ant all' in about 2 minutes! NICE!