I thought it was the themes for me too, but even when I change back to the original theme my memory still disappears. I started losing huge amounts of memory with .103, which is about the same time (IIRC) that themes started coming out, so it seemed like a good place to start looking.
No, I don't notice any serious problems with performance until I get down around 0 MB of app memory, which is something that never, ever happened until .103.
Anyway, I'm having some other issues with .109 that are more troublesome to me, so I'll just wait for the next one and see how that goes.
