Downsizedc.org is one of my favorite sites on the web, and in honor of its greatness, I've applied a nice banner to the blog shamelessly plugging the "Read The Bills Act." If you support not being an idiot, I suggest you take a look.
The site makes it very easy to send messages to your Representative and Senators supporting small government and civil liberties issues. I use it all the time and it's one way to say "I did something" about issues you think are important. It's a great resource and their newsletter is well-written and very informative about bad legislation that are ignored by the news networks.
I also use congress.org to send messages, as I've found that I get a sooner reply from my Rep and Senators. Plus I can send emails to Mr. President, for what it's worth!
I encourage anyone who is passionate about these issues to check these sites out.