What programs do you use to development?

[Sanddorn]

Mac:
Editor
TextMate (there is a clone for Windows http://www.e-texteditor.com/ watch the screencast!),
TextWrangler for quick edits

PHP Module from Marc Liyanage http://www.entropy.ch/software/macosx/php/ for local testing
Cyberduck for FTP, swizz made!
Firebug

Windows(only for testing):
Notepad++
Total Commander for FTP ( http://www.ghisler.com/ ) Old School, Norton Commander Style, swizz made , i love it
Firebug
Virtual Box and the offical Microsoft VPC Images for IE Testing
Picasa (there is no Version for my G5 iMac), it is very easy to use for my clients. I prefer Adobe Lightroom on Mac and Windows.