I have a Compaq iPaq 3870 running GPE from http://handhelds.org, this is a debian style distribution. My iPaq is now successfully running Apache 2, PHP 4.3.7 and MySQL 4.0
Ive got CVS compiled on it as well and can cvs co any tiki branch onto a mounted memory card. I told apache to look at the memory card location for its document root and can bingo. It works.
For the size of TikiWiki the speed is impressive, i thought it would be slower. I'll do a proper installation guide as soon as time allows for the InstallTiki page.
In the meantime if anyway wants help setting up a similar environment, shout for me.