I have released mysql-query-builder 1.0.2. Still lacks formal documentation, but 100% covered by unit-tests which can be treated as such.
MySQL Query Builder is a set of PHP5 Classes which can… (surprise!) build correct MySQL5 queries for use with PDO‘s prepare/execute. This things rocks really hard if you need to implement some kind of database layer (I implemented ActiveRecord this way) in your app and building queries in dynamics.
Do you plan to implement joins as well (joining multiple select queryies)?
David: some day… that’s not on priority list now
although, you can already make queries on several tables now and use setSelect() to specify columns you want to get in result
so, some kinds of joining is already possible