I had been looking at some resources to start my quest in C# 3.0(especially LINQ). I came across this channel9 video on Linq by Anders Hejlsberg.
It was a nice video with samples that will help you get upto speed on Linq. I am surprised that guys in Microsoft keep coming up with some cool ideas for every new release.
Everyone will agree that there is a big gap between the relational world and object world. I think Microsoft is trying to reduce that Gap with LinQ. I can already see many ways of implementing Linq in many areas in my project.