As a site administrator tool I have to list all checked out files in the site collection. Looking at the DB is looks like the tp_CheckoutUserId field in AllUserData might be a key to this query.
Is it possible to get this information through the web services or will I have to use the object model?
Update: It seems like the customer would like to be able to list just those files that have been checked out (not necessary modified) by a specific user. Onless the query takes several minutes it should be a realtime query, but the site collection consist of +10 000 web with 3 document libraries on each web so performance might be an issue.