I read somewhere that there were three polls you can safely ignore because of horrible sampling techniques: Newsweek, LA Times, and NY Times. You need to look into the internals of the polls to see who they are sampling: registered voters/likely voters, percentage of Dem/Rep voters and so on. The Newsweek poll just released surveyed 1/2 the people before Kerry spoke, used only registered voters and sampled too high a percentage of Dem voters. Though the errors may have cancelled each other out, it is still a bad way to do it.
The Gallop Poll seems to be the outlier as well, so you can probably assume Kerry has a slight lead with little bounce rather than Bush getting the bounce from the Dem convention. It doesn't really matter though; using Pinnacle as the guide seems to me to be the best way to do it.