The Presidential Inaugural Committee (PIC), which is, as the name says, organizing Obama's inauguration event, has created a site where you can see big chart detailing each and every contribution they have received.
The committee only accepts individual donations, and you can sort them by name, employer, amount, and location. "Unlike previous inaugural committees, the 2009 PIC does not accept contributions from corporations, political action committees, labor unions, current federally-registered lobbyists, non-U.S. citizens and registered foreign agents and does not accept individual contributions in excess of $50,000." You can see several well-known names there: several people from Google, Dreamworks, The Container Store ($25,000), Yahoo!, and the Soros family - who donated a total of $250K, being $150K under the Soros Fund Management employer name.
That's the thing about transparency: if information is available, people ARE going to make their way to it. It's really a simple and revolutionary idea.
