This package has been moved to Bitbucket. You can find it here:
I use Windows Powershell quite a lot, so I've put together a ST plugin to filter the selected region(s) through a PS command.
EDIT: Supressed child process window.
EDIT: Added note about how to start a subshell without blocking Sublime Text forever.
EDIT: Added WindowsError info to error message + extended docstring.
EDIT: Non-ascii languages supported (Python + UTF-8 + Windows + BOMs = REALLY HARD HEADACHE); hope it helps somebody! Also, I think I should stop doing version control on the forum.
EDIT: Now non-ascii strings passed to Powershell should really be interpreted correctly...