Here is an interesting study done by the Congressional Management Foundation which I had never heard of until today.
The Internet is generally having a positive effect on the discourse between citizens and Congress. A large majority of congressional staff surveyed, 79%, believe the Internet has made it easier for citizens to become involved in public policy; 55% believe it has increased public understanding of what goes on in Washington; and a plurality of 48% believe it has made Members more responsive to their constituents.
More interesting findings below the fold