Well I found a site, though it doesn't seem fully developed (just over 80 members), that should be a really great tool for anyone interested in not just rockabilly music, but a rockabilly and vintage lifestyle.
On the rockabilly network you can interact with other people with similar interests. You can listen to music and see suggestions for little known singers and bands. You can also see what events might be going on in your area relating to your interests. I know too often I find out once it's too late about car shows or concerts.
Another great site for listening to music is Rockabilly podcasts They have a variety of podcasts that you can load onto your itunes/ipod and listen to on your computer. I'm never a huge fan of radio announcers, and some have more talking than others, but they do have great music and help pass slow days at work.
Lastly, the Subculture Collective stands as little rougher, psychobilly version of the Rockabilly Network. The music, podcasts, and information on this site is geared towards psychobilly music more than rockabilly and vintage classics, but if you're interested in it, it's a great resource.