I’ve accidentally stumbled onto Pandora, a twisted combination of a subscription-paid custom-playlist radio station and music discovery service. You enter an artist or song name and it starts playing “similar” music; you can have several of these stations to which you can add more and more interests. The first 10 hours are free, and after that it’s either $12/quarter or $36/year, which IMO is rather fair. You can pause and skip tracks (skipping is limited to a certain number of songs per hour). On the technical side, it just needs flash player 7 and streams in 128kpbs.
Onto a few recommendations. For a few songs I’ve bothered adding iTunes Music Store links simply for convenience:

• Rosie Thomas – Death Came and Got Me (on of the reasons for crying in the previous post)
• Joe Purdy – Washed Away (from Hurley’s CD-player in “Lost”; both albums are good)
• Damien Rice – O (more folk music)
• M83 – Dead Cities, Red Seas & Lost Ghosts (found the album via a song from the Nightwatch-trailer)
• Craig Armstong – Ruthless Gravity (synth-heavy strings; heard in “Layer Cake”, again the two albums are very good)
• Armin van Buuren – Shivers (Rising Star Mix)
• Anne Clark – Sleeper In Metropolis (Hardfloor ’97 Version) and Our Darkness (Total Eclipse Remix)