[not_so_young_greg]

I agree with xtech - filtering out of stock products should be made configurable in Refine Filters admin end.

I also agree there is something not quite ok with filters selection - if "Remember filter selection for categories in user session" is ticked and I select a manufacturer and go to another category (or home page) and go back to the same category again, selected manufacturer stays selected but all other manufacturers are disabled. I cannot deselect it by clicking on the checkbox. To be precise - I can deselect it, the checkbox is empty, all products show but only previously selected manufacturer is active.
This does not happen when I deselect by clicking on remove link - then it refreshes properly. It does not happen when I stay on one page and play with filters - it only occurs if I go to some other page.

Well, in my case I just diabled "Remember filter selection for categories in user session".