Google Wave is The Next Big Thing that is going to change online communication as we know it, etc (until the next thing comes along). From what I can gather, you can treat a wave as though it was email, twitter, instant messenger, or even a blog. You can embed video, links, pictures, games, comments, edits, voice chat … and anything else anyone can write an addon to do. Or in other words, I actually have no specific idea how I’d use this thing at all but I see the possibilities there for collaborative working and gaming, and I want to experiment with it myself and find out. Naturally I’ll do my best to break it along the way and pass on any bugs I locate.
SWTOR is just a game.
No guesses as to which beta I’m more keen to get into at the moment.