What are common drawbacks, gotchas, and problems of choosing Vista 64-bit versus 32 bit? We recently purchased two laptops and selected Vista 64 bit, but I'm considering downgrading to Vista 32 bit on both. The only reason for going 64 bit was to get access to the additional RAM.
Obvious issues include that many drivers only come in 32 bit versions which won't run in 64 bit Vista. Less obvious is that ODBC drivers are also drivers - they can be accessed using a 32 bit ODBC manager included in Vista 64 bit. Some programs which run fine under the WOW (Windows 32 bit on Windows 64 bit) environment include 32 bit printer drivers to facilitate for example printing to PDF. That doesn't work so fine.
What else is there?