Grooveshark -- Much better than Pandora.
Jolicloud (and Joli OS) -- Good dual-boot solution for a netbook or old laptop. It's based on a slimmed-down version of Ubuntu, and the same theory as Chromium OS (you mostly use your computer for the internet, so why bother with the rest of the operating system?). Loads quicker than Windows and does what I need it to. Plus you don't really need to worry about malware, and the desktop syncs with Jolicloud, so you can access it anywhere. Here's a link to my account, if you wanna check it out.