Ask YC: Any good Rails log anlysis tools?

We've been looking for a way to analyse our Rails production logs, but haven't really found anything suitable. Basically we'd like something which can (1) provide site traffic information on a slightly more real-time basis than Google Analytics, (2) help figure out which pages are taking a long time to render, or are heavily loading the database, and most importantly, (3) pull out any errors thrown by the code. Does anyone have any suggestions for tools which might help do this?