Republicans will take the House but not the Senate, but having control over 1 house of congress means they can no longer stand obstinately in the Democrats way and say no to everything, since along with control comes the responsibility to deliver results, especially for Tea Partiers who may be somewhat wary of Republican leaders they don't trust much more than Democrats since most of them have been in politics for just as long, or suspect (rightly so) that their movement has been shanghaied by establishment candidates and corporate special interests for political expediency.
The fact of the matter is that Sarah Palin (not directly, although I wouldn't be surprised if she gets blamed for this) is more or less responsible for losing the Senate to Democrats, as some of the key races (DE, NV is a lot closer than it should have been) would have easily gone for the Republicans until the Sarah Palin-backed TP candidates unseated their mainstream opposition in the Republican primaries. It's going to be incredibly easy for the Republican leadership to paint her as a person who lost the Senate for the Republicans in 2010, lost the Presidency for the Republicans in 2008, and her vulnerability over quitting the governorship etc makes her wholly unable to win against barack obama. Sarah Palin perhaps represents one of the biggest challenges for the Republicans in the next 2 years, as someone who enjoys extremely strong Tea party support but is ideologically so far to the right that they can't attract moderates and undecided voters in 2012 in enough numbers to challenge Obama's re-election. So yeah, her rising star won't be rising for long.
In the meantime you've got a lot of Republican pickups in the Governorships across the country, mainstream establishment and even corporate republicans who will no longer be able to count on stimulus money to support their ailing economies. This is because in the republicans in the house and senate will do everything in their power to stop the stimulus/obamacare and extend the bush tax cuts, and unless they're able to drastically slash government programs they're going to have to either vote to increase the federal deficit or shut down the government, 2 situations which will have disastrous consequences in 2012.
So yea, the Republicans have been able to ride the Tea Party's anger and anti-obama sentiment to victory but the honeymoon isn't going to last, they are going to have a really tough time translating that into further success in keeping Obama out of office for a 2nd term. Then again the Democrats did a really piss-poor job of selling the country on their accomplishments and the Republicans really did pull of a masterful job of marketing themselves this year, so you never know how the election season will play out. The Democrats unfortunately don't have the luxury of playing the "no compromise" promise that Boehner made (which I don't suspect will last anyway) against them the way the Republicans did in Obama's first 2 years, since the political narrative doesn't seem to favor Democratic foot-dragging and filibustering the same way it does for Republicans.
Still, the reconciliation between Tea Party ideals and the realities of actual governance, the continuing rift in the Republican party, and the search for the next Presidential candidate will definitely be interesting to watch.