Mindmap website recommendations?

Anybody have experience with mindmapping apps / websites? I’ve always found mindmaps useful and am thinking I should be using them for essay planning / research. There are a huge number of possibilities listed on wikipedia…I like the idea of an online solution so I can quickly access it anywhere, and am currently looking at comapping.com and mindmeister.com. The former is nice and quick, if a little visually dull – sure, left->right might be easier to understand, but it’s not as exciting. The latter isn’t based around flash, hooks into twitter/skype, and generally feels and looks more web2.0-y (not that this means anything). I’ll give them both a try over the next few days – anything I should particularly be looking at? I’m really after the one that’s destined to be bought by Google…