I used Vista's MKLINK to symbolic link my World of Warcraft\Data directories -- hard junction links (MKLINK /J). Worked fine. Patched this morning, got massive errors. Ran the file check program. No luck. Apparently WoW.exe was 2.4.3, but the Data directories weren't -- or vice versa, not sure. And when I tried to repatch, it would say, hey, you already have 2.4.3, you don't need to repatch...

Solution: deleted the symbolic link, copied back in World of Warcraft\Data, copied the old WoW.exe, repatched, and finally, back in business after half an hour.

But, now I gotta do that I think with my other three directories...