C#
- C# 4.0 in a nutshell, O’reilly, ISBN 978-1449380458
- Pro C# 2010 and the .NET 4 Platform, Fifth Edition, Apress, ISBN 978-1430225492
- Effective C# (Covers C# 4.0): 50 Specific Ways to Improve Your C#, Addison-Wesley Professional, ISBN 978-0321658708
- More Effective C#: 50 Specific Ways to Improve Your C#, Addison-Wesley Professional, ISBN 978-0321485892
- CLR via C#, Microsoft Press, ISBN 978-0735627048
- C# in Depth, Third Edition, Manning Publications Co., ISBN 978-1617291340 http://www.manning.com/skeet3
- Freenode/##csharp for chat https://webchat.freenode.net/
ASP.NET
- Pro ASP.NET MVC 3 Framework, Apress, ISBN 978-1430234043
Version Control Systems
Language Comparisons
See also .NET specific resources
Thanks to ##csharp/freenode for the links!