Rating: 

Informative and well organized. Good TOC. Includes an index, which is a very nice feature missing in most O'Reilly pocket references (at least the ones I have). Doesn't cover C# documentation comments, eg, summary. Attributes are not covered very well.

TIP: If you're thinking of buying the VB.NET Language Pocket Reference, DON'T. See my review of that book. I recommend C# and VB.NET Conversion Pocket Reference instead.