So if you are interested in checking out your friends, family members, neighbors, coworkers, and/or countrymen to see who they supported in this last election, all you have to do is search here:

http://www.fec.gov/finance/disclosure/advindsea.shtml

You can search for contributions made by individuals using contributor name, city, state, zip code, principal place of business, date, and amount.

If you are specifically interested in who they supported for president, you can put in their:

Name and/or
City and/or
State and/or
Employer

Then set the date range "From" 01/01/2008. (You can leave the "To" range blank.)
Select "Federal Contributions"
Then select "Send Query"

You'll get a list of all names and contributions that match your specific criteria. You can then drill down on each contribution to see the actual disclosure form with their name, address, and contribution information on it.