The last real stage (for non-sprinters, anyway) is a long (52 km), flat time trial:
The podium appears to be set, but the rest of the top 10-20 is pretty fluid. A lot of guys will have to gut it out on tired legs today if they want a high finish.
I'm curious to see how Froome and Wiggins do. Froome seemed to really want stage 17 and apparently wasn't allowed to leave Wiggins's side; will he go all out now to possibly win?