Our local PBS station in Hampton Roads Va WHRV plays a lot of blues and Paul Shagru's program "Out of the Box" features an all blues program on Friday nights. He is really supportive of our local blues organization (Natchel' Blues Network) and plays and promotes our local musicians, blues and otherwise. We also have a high school radio station, WXRT , that has a great 3 hour blues program every weekday!
Our local "community" station, KDHX-FM, has a variety of blues programming. Most is on at the evening time-slot from 3pm or so. They webcast, and you can listen to archived shows as well.
Can't easily put up links from my squad-car computer, but it's just:
I've just started hosting a weekly Blues show a few weeks ago, on blogtalk radio.
The show airs live on Mondays, from 2-4 PM (EST), but is available for streaming and/or downloading, as soon as the show is finished.
If you're interested, here's a link: http://www.blogtalkradio.com/eclecticladyland
There are 2 shows in the archive, so please feel free to check them out.