Well, those certainly stacked the odds against Philly. Just about every time I watch them play I realize what a good Passing O-Line it is...McNabb usually has time to eat a sandwich before he throws, even when he stays in the pocket. But they "never" run, so you won't see them show up in the top five of any rushing category.
I decided to look at these teams, as I remember taking a look before as successful O-Lines to find a common thread, and that thread seems to pretty much follow through to this year. When you look at the six teams above, with the exception of San Diego (who completely gutted their line last year), every one of them has a line that has pretty much been together for years. Of course, there always has to be a new guy at some point, but basically each line has at most 1 player getting their first start with the team this year.