edit 9/24/09: It appears that the Senate Judiciary Committee will be looking again at telco immunity and executive wiretapping authority. The EFF hires lobbyists, too, and needs your support to take advantage of this opportunity.
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If there's one nonprofit you can trust to use your money in your interest, its EFF. If you have money to make only one donation this year, please make it the EFF. If you donated to the Obama for America campaign, and now object to what he's doing with respect to warrantless wiretapping, torture memos, or even Wall Street, donate to the EFF to restore your conscience, karmic balance or service to liberty (take your pick, choices are nonexclusive).
Addendum: I don't regret voting for him, but he hasn't received a dime from me since his July 2008 Senate vote, and he won't until he upholds the 4th Amendment.