If McCain at least retains that 49% number (maybe goes higher with further press coverage of Palin's speech), he'll be in the 47-48 range on Rasmussen. Again, this is all speculation because the raw, daily numbers aren't available (or at least I don't see them).
I would suggest that the last three days have all been about Obama by just over 1 or very close to that. Weds and Thurs were very good days for us and I was expecting a much better Thursday. Yesterday was clearly disappointing in that it was likely still Obama on the plus side. If there is a bounce coming we haven't seen it yet. I'd suggest all we've seen so far is the dissipation of the Obama bounce and now we're back to square one.