I'm not too savvy on wikis or group projects, but I think this is something that we can all work on. Please contact me at lskatz+biophp at gmail.com if you would like to help modify the code.
There is another BioPHP that is much better than this one, labeled as Mark's biophp on http://biophp.org.
Functions so far include
To install, unpack all files into a biophp directory. At the beginning of any php file that you want to use biophp with,
<? require_once "biophp/Bio.php"; ?>
Documentation is still lacking, but each file is heavily commented.