Aural Moon - www.auralmoon.com - includes the Gagliarchives plus a whole lot more - prog rock at its best
SomaFM - www.somafm.com - techno, electronica, lounge, indie - all stations at least 128k and very well programmed, plus lots of other formats and bitrates
There are a ton of college and independent radio stations that also stream and, while the quality of the content can vary widely, almost all of them have something worth listening to. I used to live in Eugene, OR and there are 3 really good stations there: KLCC, KRVM and KWVA. I'm listening to bluegrass on KRVM right now, even though I live in NY... :-)