Gallup Daily: Obama’s Lead Over McCain Expands to 11
That said, let's keep in mind what is true about pre-election polling, according to this piece by Open Left's Chris Bower.
Bower points out that the largest margin for victory in the past 16 national elections has been 8.51% (Clinton in 96), and that these days, a "landslide" is considered between 5-8%.
So, yes, 11% is good news, because, one, it indicates a causative response to last night's debates (which is that, yes, Republicans, Obama won), and, two, it beats the polling margin for error and indicates a true lead among likely voters.
Still, be prepared. The numbers will come down, at least a little. It's almost a certainty.