A replacement to e-mail? Well, that's an ambitious goal, but it's the idea behind Google Wave. It's what you'd get if you married e-mail with instant messaging with a wiki.

Google Wave's creators argue that e-mail and instant messaging are just the electronic version of snail mail and phone calls -- and that's limiting their potential, making them not really as collaborative and media-rich as they should be. Instead of sending an e-mail back and forth and everyone getting copies of the communication, a wave is hosted in the cloud, and anyone you invite can work within it in real time, adding video, images and digital tools.

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And if you still don't know Google Wave is, watch this great little clip at Gizmondo