Thanks to John Piwowar for pointing this out to me. It was originally posted to twitter via @alanwill, RT via @carymillsap and then John told me about it in an email exchange.
Anyway, you can find a little more information here. Go to The Market and search on "oracle" (not oow).
The obligatory screenshots (lifted from the link above):
I've already got everything on my Google Calendar, so I'm not sure how much I'll use it, but I'll definitely give it a go.