Over at http://widgets.yahoo.com/workshop/, at the bottom of the page, Yahoo! has an interesting download called the UNIX Utilities for Windows. This is offered as a "workaround" for "legacy support" for building Konfabulator widgets that were originally compiled for the UNIX environment.
However, I've found that the list of executables dropped into C:\Program Files (x86)\Yahoo!\Widgets\UnixUtils\usr\local\wbin is rather extensive. There's a LOT of UNIX-like commands in there! I dropped that path into my Windows environment path and I am rather pleased by all that's available now, things like "grep". I had that in Cygwin but now I can do this within the cmd.exe environment.
I'm reinstalling MinGW, not sure that MinGW has as many handy commands in its precompiled bin base.