I found the The Design Patterns Smalltalk Companion to be 'the better' GoF book. It is not as dry as the GoF book (but close) and the patterns are much, much better motivated and explained.
That the example code is in Smalltalk, is IMHO an advantage (even if you don't know the language) but obviously this depends upon personal preferences.
If you want a C# and .Net specific version of Patterns of Enterprise Application Architecture, take a look at Architecting Applications for the Enterprise.
You can also find some bits and pieces about patterns in 'Clean Code', a book some people seem to really like (I personally think it's atrocious).