Well I have started on a simple example for the wiki.
http://wiki.apache.org/ibatis/ How_do_I_use_a_Custom_Type_Handler_with_a_BLOB_or_CLOB
We have been experiencing some problems with the wiki but this faq seem to be working.
This is the second time I've seen someone write about problems with the wiki in the short time I've been on the list. Has anyone considered switching the wiki to Confluence? I've been using Confluence and Jira (the issue tracking system from the same company) on a couple of projects and it's real nice. It's not cheap for commericial or educational institutions but it's free for open source projects. See http://www.atlassian.com/software/confluence