I agree that a wiki on the iLiad would be great-- I love using wikis to organize my info-- but wiki is a web application, so you'd need a web server for most versions. As far as I know, no one has ported Apache or any other web server to the iLiad yet. I'm not sure if Apache would be too resource-intensive. One of the many talented iLiad developers might be able to give an opinion.
There are two alternate variations: client side and P2P wikis. A client side wiki would manage the editing in the web client, but I don't know as any of the web clients on the iLiad have enough support for DHTML (including Javascript) to handle this. (And I think you'd still need a web server.) A P2P (peer-to-peer) wiki does exist, which doesn't require a web server at all, but it would need to be ported to the iLiad, and it's not open source. See
http://en.wikipedia.org/wiki/Peer-to-peer_wiki for more info.