If you post info about your upcoming gigs on more than one site, like MySpace, Sonic Bids, Facebook, Twitter, etc. I just found out about a service that could save you tons of time!
All these networking sites are great means to help you market your act, but it's so time consuming to update each one. I know, because I have to update all of ours and I've been hoping to find a service that would centralize it.
One of our upcoming performers uses this service called www.artistdata.com She posts her info once and they can feed it to a number of other sites & blogs. I snooped around on their site and their service just seems to be for artists...if anyone out there knows of one for venues...let me know!
Good luck with your publicity efforts!