Mind Mapping without having to download a program!

I haven't had a chance to post or poke about on the web these last couple of weeks, but I can't resist sharing this link to bubble.us courtesy of PaperbackWriter. It's Mind Mapping - but without the need to download a program. Does anyone else find that concept as appealing as I do?

The online program looks quite fun and you can edit, share, save, export, print your output, and probably quite a few other things than I've not had time to discover.

Hmm, now that I've shared the link, I'm curious. How many use an actual program to mind map/brainstorm/figure stuff out? What's your favorite? Would you find something like this helpful, or just another time waster?