After using Vista for a while I was having trouble switching back to the Windows-XP version of Windows Explorer at work. I especially missed the bread crumb that makes it really easy to go to different folders along the current path.
There had to be an alternative out there. Turns out there are a few, but one that is free and has a bread crumb bar is UltraExplorer. It is very customisable, has loads of features, and seems quite usable in my experience so far.