72Longhorn,
Avcrew.com is a good web site... mostly for entry level corp pilots but I've seen a few good jobs posted from time to time. Unfortunately, most of the top end fortune jobs are word of mouth or already waiting for someone. You really have to know someone in addition to having all the credentials to get in. Most that I know of require around 5000 total time, corp experience, a solid reputation, and most importantly, be able to get along with everyone in the department. Network, network, network...
Are you giving up on the airlines? Just curious. I've noticed quite a few regional and even a few furloghed major airline pilots coming over to our end of the business.
Good luck,