I go around a lt of MP3 rotation sites. There's also a Local music channel; they show mainstream music at times; but considering the local scene, I learn a lot of bands. I also learn them from local publications. =P Other-radio based websites that build off your preferences. Pandora's pretty good for finding new music.
To find a music blog that features music you like google the name of your favourite song or band along with "blogspot" and you should come up with a list of great music blogs to visit.