glad to see this thread....my pb g4 ti connects to airport express, no problem. my new mb c2d, however, has a hard time connecting and when it does, it has a really weak signal/drops every 30 seconds.
my MBP's connection seems to be a little spottier after this update. Before I always had 4 bars and never had any dropped connections. Now the bars occasionally drop to 3 and I'm not sure if I'm actually dropping a connection or not, but adium seems to disconnect and reconnect a bit more than it did.
Not that this is causing any real problems as it's barely noticable really, but it's a slight change none the less.