There's no central repository of queries that I know of - certainly nothing official. I'd be surprised to be honest - the whole point of the query engine is to allow you to create and tailor your own, so I would imagine most custom queries would be unique to their creator's environment.
With regard to percentages - which version of ePO are you running, and can you give an example of what you're looking for? I know that percentages on pie charts were introduced at some point - they're certainly there in 4.5 P3.
thanks for the reply - we are only in Epo 4.0 and there are no percentage reports that can be produced
Yep, just had a quick look and it looks like percentages are only in ePO 4.5 - sorry