Everyone else has given you some great sources of information. I just wanted to give you a few practial gotchas I've run into.

• Forgetting binmode on binary files on windows. Get in the habit of using binmode on binary files even on *nix
• Using backslashes in paths (when porting from windows to *nix) forward slashes work fine on windows but some windows-only developers (read VB) tend to use backslashes
• Globbing (or the lack of on windows) in the command line. Windows shell will hand you "*.txt" from the command line.
• File permission problems (when porting a program from a VB programmer who does not understand them to *nix)
• Problems on windows when trying to open filehandles to/from pipes. Again it is a limitation of the windows shells

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flounder