I've been using Winstep Xtreme for a while now (ever since GAotD) on my Win 7 64 bit computers and as much as I used to love OD, the problems with the 64 bit OS were too much.
I also love the fact that the themes can skin all the docks, shelves and task bar at once. I like to match my Windowblinds and my Winstep themes.
I do miss the tabbed docks you could use like pull-out drawers but I love the sub docks too. You can use both at the same time. (or those two plus Rocket Dock, Moby Dock Etc.) With the docks, shelves and menus in Xtreme, I have it all covered.