This is probably old hat, but here it is:
http://www.codeplex.com/LINQtoSharePoint. Our Information Worker group had its regular meeting last evening with a special focus on development. When exploring all the ways the development experience could be improved in the next version of SharePoint (develop on a workstation! yeah!) one of the attendies asked for LINQ querying lists. Somewhere in the back of my head it rang a bell, but I couldn't put my finger on it. So here it is, follow the link above. Never underestimate the power of CodePlex...