Real Clear Politics has its round-up of the current situation. For the House, they are showing 205 seats Likely Republican or Lean Republican, with 37 seats labeled Tossups--meaning that they could go either way. But only one of those 37 seats is currently held by a Republican. If even half of those seats go Republican, that's a narrow Republican majority in the House--and this is a year when Democrats have a lot to fear. The electorate that is going to vote is furious.
The Senate is almost as good: 45 seats are Likely Republican or Lean Republican (or a Republican holds the seat and does not have to run this year). Six seats are Tossups--and every single one of them is held by a Democrat right now--including seats that should not be in play, such as Barbara Boxer (D-CA), Reid (D-NV), and Patty Murray (D-WA). The Democrats might hold the Senate, but it won't be by much.
All that said, I really wish that I had more hope for the next Congress. I fear that the same garbage that dominated the Republican Party for most of Bush's two terms is going to still be in charge--a crowd that is better than the Democrats, but not by much. I hope the Tea Party is getting the message through to the tax and spend establishment Republicans--we are way past the point where more of the same is going to work.