How Web 2.0 is the Rugby World Cup? Officially, not very by the looks of things. I did manage to find a single RSS news feed, but its an all or nothing affair that provides headlines only. Still, if there is a feed then that's a start at least... there is a lot you can mashup from that with a bit of effort.
Australia's ABC isn't too bad as their Website has some interesting Web 2.0'ish features including personalised tagging and a tag cloud anyway - but its a shame that the tag data doesn't make into their RSS feed; and there is nothing special for the Rugby World Cup either.
Overall verdict: Thumbs down.