According to the NY Times, there are 138 Total Tea Party candidates running for House and Senate seats. 38 are African American, which is quite interesting for a group alleged to be racists. Of this total number about 41 are expected to actually get elected. That's less than 10% of the 535 members of both houses.
http://www.nytimes.com/2010/10/15/us/politics/15teaparty.html
So don't get your panties all in a bunch fearing a Tea Party deluge. If they govern like the Constitution says, there should be no real problem. If that doesn't pan out, it's unlikely the Senate will have 60 of either party that they need to move legislation. Failing that, we come to the weak link in the chain, Obama. He can't be counted on to stand with us. If he does, great. But I wouldn't get you hopes up based on his actions so far. After that, the courts are a crap shoot depending on which circuit you are going to.
Overall, I don't think it's going to make a whole lot of difference.