Some helpful links: 

• Open Source Tools Demonstrated:
  • Nunit
  • Cruise Control .NET
  • NCover
  • NCover IDE Plugin - Download location TDB. Will be available very soon.
  • NAnt
  • TestDriven.Net - IDE Plugin for Nunit
• Books / Blogs:
  • Martin Fowler - A wealth of information on software development
  • Expert .NET Delivery - nAnt. Cruise Control, Agile DB, Codesmith
  • Rob Caron Blog - Team System Central
  • Craig Larman's Anothergood Agile Management Author
  • Joel on Software - Joel's take on software development 
• Agile Development
  • Agile Alliance - Group Dedicated to Agile Software Development