Rasmussen shows the race all tied up:

In the first national polling results based entirely on interviews conducted after Sarah Palin’s acceptance speech, Barack Obama gets 46% of the vote and so does John McCain. When "leaners" are included, it’s all even at 48%.

Zogby's online poll shows McCain-Palin leading Obama-Biden 50 percent to 46 percent.

Update: Gallup has McCain-Palin ahead by 3 points.