another one like this is: http://hyperdock.bahoom.com/ bit more pricey though.

moepstar · on Sept 30, 2012

For one, HyperDock has an other purpose than Slate et al.

And, what absolutely bugs me about HyperDock:

It never ever has worked for me in a predictable way across 10.6., 10.7. and now 10.8.

I've had/have to, for the window preview to work, always open the program in question which kind of voids the whole purpose of the app...