I chanced upon Ms. Caitlyn Martin's experiences using 64-bit Ubuntu and found that she did not have a near-perfect experience, e.g., sound does not always work. I agree with her that 64-bit computing is not being used since most applications are not primed for it, i.e., mostly use only 32-bits. If you have a 64-bit machine, I urge you to install a 64-bit operating system to maximize performance.
My experience differs from Ms. Martin's – I use a 64-bit Solaris install and a 64-bit Ubuntu install on VMWare Fusion running on Mac OS X. Like her experience, the performance boost is really evident – it is definitely faster. However, mine did not have the audio quirks that she experienced. , huh?
Again, don't believe us. Try it for yourself and weep. Weep that you have not been using your machines to its full potential. :D