If you mean the iPod universal docks, yes. I use mine original uni dock w/ a regular case & it works fine. Great fit, no give at all. You get the annoying "not optimized for this iPhone" message, but dismiss and go on w/ your biz.
I plan on modding my old 3G iphone dock so that it fits with the Bumper (when it arrives). So far for now the iPhone 4 fits and works naked. It may look ugly when i'm done but as long as the iPhone+Bumper fits that's all i care about lol.