Typo in the features list:
Globally unquie form field names provide for a high level of internet sercurity.
--> unique
"Note: During BETA phase, I will be uploading updates without changing the version number."
Why not use a version control system, like mercurial or git, that are linked to in the wiki article or Subversion?
Instead of huge include_once lists that bloat up a project....try autoloading
This in turn requires to make one file per class - which I personally find a good way of arranging things anyway.
Have a look at PHPDocumentor great way of producing doumentation and getting infile documentation up to a great standard.
An UML overview to see how the components interoperate would be nice.
regards
Bjom