I'm going nuts.
EDIT:
Found something.
Colibri is the retarded cousin of Quicksilver, but at least it gets done the launcher aspect of QS, if not the pipes and manipulation actions.EDIT #2
AppRocket is better than Colibri but still not quite there either, but at least something useful comes up after hitting Ctrl-Space.
I wish I had known about this when I had administrative rights at work... Currently, checking it out for my laptop.
True, there doesn't seem to be one designed to mimic quicksilver (yet)... I'm sure that could be done, though.
Widgets are mostly graphical, but really they're just scripts and a scripting engine that can do whatever you want (as long as it has rights on the local machine). Most of them are clocks and weatherbars and crap... but there are some useful ones, too.
I think a quicksilver-like widget might be useful. If you develop it, I'd use it ;)
Otherwise, (e:paul)'s suggestion to use the start-R function is the simplest solution to your needs.
None of the widgets really are like Quicksilver, unless I'm missing something?
Widgets are graphical, and I'm looking for a keyboard-based launcher, which does text and item manipulation and is scriptable.
I'm checking out <a href="http://candylabs.com/">AppRocket</a> now, a Google search for "Quicksilver for Windows" turned up some possibles.
There are several mac-like launcher programs available for free via Yahoo! Widgets.
:::link:::
There's all kinds of other neat things widgets can do. I'm thinking of putting together an estrip widget, if there's interest in having one.
It's not exactly the same but hit windows key, then R and type in the program name. If it's in your path it will run.
e.g. windows key +r type 'notepad' starts up maya for me.