I just stumbled upon dev.events – a nice opensource database of tech events to know what to attend to next, including some online events. For each event contributed, you get karma points. Neat!
If you are a speaker, you can filter events by CFP.
Nice design, RSS feed, iCal export. Developer and designed by a pretty woman in tech – Julia aka Coding Unicorn. I am not sure where the product gets information from, but the list looks comprehensive.
Check out dev.events.