I don't have anything particular planned, but there are a bunch of reasonable free pick 'em sites around.
My workmates are using
http://www.pooltracker.com, which seems functional but is pretty ugly and clunky to use!
I just had a quick search and here are a couple of other options:
http://www.sportguru.co.uk/rwc/http://www.superbru.com/rwc/I just took a closer look and these are both powered by
http://www.sportengage.com/ so very similar.
If someone else wants to take the lead and set up a Rugbyheads RWC pool somewhere then that would be great.

Better be quick though!!
Jules