Oracle Databases on Windows Vista
Vista got released in November last year, and I've now come across the first "big" application that doesn't currently run on Vista.
Oracle will support Windows Vista but most likely not completely until the second half of 2007!
I would have thought a company the size of Oracle could dedicate a few resources to running their stuff on the beta releases of Vista, so that it wouldn't be such a big step to get it all working.
At least I don't do much Oracle stuff, but it does happen occasionally (like today), where it is a problem.