LINQ

First of all - its pronounced like 'LINK' just so you don't sound as stupid as me when I used to called it 'LIN-Q'. I think this could be something very valuable for us. Given all the object queries and manipulation that we do I could see a lot of benefit. This is a good video (kind of long though) which explains some of the basics and the potential of the language. I would recommend working your way though it (and LINQ in general) in your free time.

http://wm.microsoft.com/ms/msdn/visualcsharp/wes_dyer_2007_01/WesDyer_0002.wmv

Good overview on LINQ (if you search codeproject for LINQ you will find plenty more):
http://www.codeproject.com/vista/LINQ_1.asp

Getting changed entities in LINQ to SQL (this is kindof interesting I think):
http://dotnetslackers.com/articles/csharp/GettingChangedEntitiesFromLINQToSQLDataContext.aspx