Seems that the much-touted Family Pack discount program for copies of Windows Vista Home Premium got off to a rocky start.  Early adopters who went in for the discount in the first few days of Vista's availability received keys that didn't work with Windows Vista.  Microsoft said they were in fact valid keys, but just for some other product they refused to identify.

Today Microsoft said they were in the process of issuing new keys to anyone who might have received an incorrect key through the discount program.  If you got burned in this glitch, you should be receiving an email within the next five days.