PowerShell and other essential Windows software for the geek

All are free or non-expiring trial versions:

• PowerShell - after using Linux terminal windows extensively (and even Putty for that matter), cmd.exe just won't do.  PowerShell is a good Windows alternative, rather than Cygwin and the like.  However, response is somewhat slow for typical commands you would type in a Command Prompt window.
• VirtualBox - compared to Virtual PC and using a Linux guest OS:  better performance (seems to respond faster), mouse pointer integration (mouse pointer can move to and from host OS seamlessly), able to install Ubuntu (with Virtual PC, because of strange display issues, could not install Ubuntu or Fedora but OpenSUSE works)
• WinMerge - text file comparison tool.  Also can find differences between directories
• Notepad++ - developer-level text editor
• PrimoPDF - print driver that enables creation of PDF files (rather than printing to hardcopy)
• Firefox Add-ons:
• Delicious Bookmarks
• Selenium IDE
• Firebug
• Some more Windows geek tools under my Delicious bookmarks
• More (short write-up to come): 
• FileZilla
• Putty
• FreeMind
• Git
• UMLet