Networking is an important aspect of web 2.0.
Some sites where you can build a network of colleagues or join existing networks:
Twitter -Sign up for an account, invite a few friends or colleagues (from outside your campus or inside?), then trade links, web tips, curriculum tips, etc. via the network.
Classroom 2.0 Ning -- Sign up for a Ning account and join this global network of educators who are asking questions and sharing ideas! Other Ning sites include Edubloggerworld and Global Education, or search for other Ning groups by subject areas (like the one for Music Techie Teachers, or this one for Science Teachers, or Math Nerds or Latin or English).
ChinSwing: Chinswing is a global message board where anyone can add voice messages to ongoing topical discussions. Share your personal interests or hobbies, debate hot issues or find answers to questions. Use features of podcasting, text forums and live voice chat to create a whole new way to talk.
Tech Circles : Use collaborative software or communication software(like Ning or Skype) to connect a curriculum circle of students from several schools, like this Theater Tech circle.