CAML! A lot of people hate it, but there are some people who love it (including myself). Creating CAML queries is often a challenge though and now we have two tools that can support you when you are in need to construct these CAML queries. Remember that for developers building custom solutions (like Web Parts) that work with data in lists and document libraries, executing CAML queries are still the best way to do it. And definitely now with the powerful SPSiteDataQuery class for doing cross-site queries and building roll-up Web Parts. So, if you need help, you have now the CAML Builder created by our U2U CAML Girl and Renaud Comte has published a few days ago his version of a CAML Builder. Nice work Renaud and you should definitely meet the CAML girl at TechEd in Barcelona so you two can have some CAML talk :)