Wen-ming on my team worked with folks from InteropSystems on a porting dictionary to help ease the pain porting source code from Unix to Windows. They took the most frequently used Unix calls and provided a piece of sample code demonstrating the equivalent function on Windows (if it exists).
Please go to http://www.interopcommunity.com/dictionary/index.php and check it out.
The team will certainly appreciate your comments and feedback on the site. Feel free to use the discussion forum on the dictionary website and share your own experiences and help expanding the dictionary.