Kyle Hailey has started putting together a much needed Oracle wait event reference.
You can access it here.
By the way, Oracle documentation also has a wait event reference section, it has more events, but it’s less detailed…
NB! If you want to move to the "New World" - and benefit from the awesomeness of Hadoop, without having to re-engineer your existing applications - check out Gluent, my new startup that will make history! ;-)