LINQPad is a tool for learning LINQ, and incidentally for replacing SQL Management Studio.  Playing around with Linq and seeing how much more elegant it is to phrase queries in Linq rather than SQL, I really feel sooo tired of SQL.  I'm missing Linq, and I wish the whole world would upgrade to .NET 3.5 right now.

Shameless plug: Actually, SQL disappeared out of my life almost a year ago, when I started working for Tech Talk.  They have an O/R Mapping product, called Genome.  And Genome even has LINQ Integration.