Battelle
http://battellemedia.com/archives/002882.php

points to a SF Chronicle
http://www.sfgate.com/cgi-bin/article.cgi?f=/c/a/2006/09/16/BUGORL6MNV1.DTL&feed=rss.business

article about Google forming a political action committee with the Federal Election Commission.

From the article:
"Google filed paperwork Thursday to register its political action committee, Google NetPAC, with the Federal Election Commission. The company intends to use the committee "to support candidates who promote an open and free Internet for our users," according to Alan Davidson, Google's Washington policy counsel."

I've tracked down the filing with the FEC (looks like more to come):
http://images.nictusa.com/cgi-bin/fecimg/?C00428623
No money distributed yet:
http://herndon1.sdrdc.com/cgi-bin/cancomsrs/?_06+C00428623

Fyi, Yahoo, Microsoft, and IAC also have PACS. Filings and reports here.

http://images.nictusa.com/cgi-bin/fecimg/?C00380535

http://images.nictusa.com/cgi-bin/fecimg/?C00227546

http://images.nictusa.com/cgi-bin/fecimg/?C00371088