Advanced Debugging Tools

OllyDbg (V2.1) - This tool is mostly for examining malware and programs. I find the tool really useful, the Assembly is very good too, especially with tracing JMPs.

Download - OllyDbg 2.0

Hook Analyser (2.6) - Able to view application crashes with more detail, and hook onto running processes for malware analysis and debugging.

Download -  Hook Analyser Blog

WinCheck (8.50) - Able to view Kernel Data Structures not available in WinDbg.

Documentation - WinCheck Blog

Download - WinCheck KernelMode.Info forum