MiniWiki is a 10k hack for PalmOS PDAs that allows memos to be treated as Wiki pages. You can place WikiWords in any text field, and they become links to memos of the same name. All the information on your PDA can be cross linked!
MiniWiki can be found at: http://www.palmblvd.com/software/pc/MiniWiki-2001-11-14-palm-pc.html
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MiniWiki is also a simplistic module for Apache: http://www.nyetwork.org/wiki/MiniWiki