I've used several 50's reversed on a K-x, and didn't like the results from any of them. I'm better off with a true macro lens (Snagged a Promaster 100mm f3.5 for a hundred bucks a while back, and then the matched 1:1 adapter for another $20 just last month).
That being said, I have a Spiratone Macrobel bellows, T-mount with an olympus adapter. Picked it up for $5 at a garage sale, and it's new in the box, never been used. Holding on to it, might snag a t-mount adapter for the Q (when I finally get a Q) and then use it similarly. Cool thing is my bellows comes with a 75mm f3.5 flat-field enlarging lens, which appears to be pretty awesome. Looking forward to trying that out
Charles.