This is a great site where you can find tons of information.
On the left side bar you can look up state and local officials, bills in congress, votes in congress, action alerts and more.
Keep an eye on the "action alerts". If anything interests you (or pisses you off) most of the links give you a place to voice your opinion and send it to congress. Some you can even enter your zip code and it will give you info on whether or not your local and/or state respresentative supports a certain issue.