Two of the examples in my MetaRails talk (given yesterday) are already out of date. Rick Olson pointed out that the "around advice" idiom has already been DRYed out a bit, and David told me that reloadable classes had been totally reworked.

I don't have time to update the slides today though -- for next 72 hours I am completely buried preparing and teaching a Java course. Don't feel sorry for me though, I get to talk about the cool parts.