Everybody else probably already knows about this, but the Telerik Trainer is pretty cool.
In my book I spend some time talking about training and recommend that you learn one GUI toolkit. The tools that come with Visual Studio do a good job, but there are things left to be desired. The toolkits from ComponentOne, Infragistics and Telerik can help you be more productive.
For my own reasons I’ve picked Telerik’s RadControls for ASP.NET. So today I’m going through their stuff trying to ramp up as quickly as possible. Their trainer tool is a nice feature that hopefully will speed things up.