>I must admit to struggling somewhat with the Entity Framework on occasion. The changes in .NET 4 look useful but I haven't had time to play with them yet......
>
>My current favourite toy is the .NET 4 Tuple class !

So far I'm liking it a lot better than in 3.5, Update from Model is way more reliable I'm no longer deleting the model and recreating it from scratch all the time. (I make heavy use of partial classes so recreating doesn't effect too many things.)

And it plays much nicer with WPF overall. It even seems to have some of the nice things that Linq2SQL had that were previously missing.

I used a Tuple last week for the first time, it was great!