OT: file name space stripper app for windows?

I get asked to post files all the time on our web site. Inevitably, they
always have spaces in their filenames and I'd like to strip that all out.

In the past I've used a batch file name renamer app, but it's GREP based and
has a clumsy interface and unless I'm doing a hundred files, it was always
easier to just do it by hand rather than configure it each time.

So, it's probably a long shot, but anyone know of a drag-n-drop app that
will replace my spaces in filenames?

We're building our own CMS right now and we're setting it up so all new
files uploaded will have the spaces stripped automatically but until then, a
quick batch renamer would be a godsend.

-Darrel