Two links that are highly useful in gleaning contributor information are:

Public Disclsoure Commission database search for contributors to state and local campaigns;

OpenSecrets.org for contributors to Federal races. Just enter in your zip code for some interesting results.

If you have other links for researching contributor information, please post a comment to this thread.

The Democratic Party of Oregon has prepared a comprehensive information technology plan for your review:

DPO 2005 IT Project