Echoes and Shadows
The music blogosphere is a formidable force, so much so that the RIAA, is frightened to death of it. It allows them to circumvent the traditional channels of releasing music and put it all out in the open. This particular music blog, Echoes and Shadows, may not be much an eye pleaser as far as its layout, but it is brimming with information about all the latest music news. I have to say that it's masthead picture of a double-necked guitar is pretty sweet and the widgets on the side are very useful. The writing quality is on par with any major music magazine and they always incorporate other blog posts into theirs, hence their impressive blog roll. Probably the coolest widget of all is the HardRadio application which allows you to listen to whatever album they're playing while you're reading.
Kings of A&R
This blog is much more professional than Echoes and Shadows, mainly because it is now a critical outlet for signing talent off the Internet. Every day they post interviews, singles and music videos of undiscovered artists and have successfully signed dozens of them to huge labels like Atlantic and Virgin. I believe that blogs like this will supplant the Billboard system of tracking hot songs, since one of their widgets already tracks the top 20 songs in all the major genres. I'm not sure which A&R reps actually run this site, but it seems that it's paying dividends.
Indie Rock Cafe
This is probably my favorite blog because it not only offers a wealth of information on bands that no one has profiled, but it allows you to stream free mp3s from new bands every single day. Their layout is a little overwhelming at first, and could definitely be cleaned up a bit, but once you sift through it all, it's more than worth it. One of their coolest features is the In Dee Mail Service which emails you a round-up of five under-the-radar bands and two of their most downloaded singles.