The Beta 2 Final of OllyDbg is now available and adds debugging of child processes to the feature list. The debugging engine is more stable and tricky, OllyDbg knows more functions now and there's a more or less consistent support for UNICODE and UTF8 in dialogs and comments. Of course also many bugfixes.
OllyDbg is a 32-bit assembler level analysing debugger for Microsoft Windows. Emphasis on binary code analysis makes it particularly useful in cases where source is unavailable. OllyDbg is a shareware, but you can download and use it for free.
Version information with download link: http://www.ollydbg.de/version2.html ■