First how to find new ones:

the paper

local publications

sit down and write every single keyword you can think of and search internet on that

Call connector friends

Ask groups about any other groups

Bloggers

get word out that you are looking

create some small thing for peopel to pass around to send back to you - with a reason to connect

Local resources:

austinist

Austin business journal

national resources:

don't forget your board

Guy kawasaki

Groups I like:

knowbility.org

Nten

Compumentor's Billy Bicket

maplight.org

http://www.aspirationtech.org/ Gunner's thing

http://craigslistfoundation.org/proto.html Darian

http://geekaustin.org LinearB's