I added my PSN account (McP485) two days ago and my Achievements page still says "Still grabbing data". I looked at a few other users and see that their trophies have updated within the last couple of days, so the problem might be that I have a relatively high number of trophies (8700+).
I'm have a PS3 and don't have a 360. While I think the OP overstates a lot of things, I do listen to a lot of the same podcasts and have noticed that for multi-platform games, the editors/podcasters tend to play the 360 versions of games. It's kind of a bummer, but I also think it's understandable (it came out first, Live ultimately has better features, etc). I, too, would probably favor the platform that I have more friends on.
I do find it remarkable that the failure rate of the 360 hardware didn't cause a mass-migration over to the PS3. Sony should have dropped the PS3 price the second that shit started happening.