Citrix is running a survey on CDN (Citrix Developer Network) asking about peoples' opinions regarding Citrix and 64-bit computing. You do not need to register to take the survey, so I would highly recommend that everyone participate.
I've written on 64-bit Citrix in the past. Currently, MetaFrame does not run on 64-bit versions of Windows. However, due to the kernel memory limiations of 32-bit Windows, I personally think that 64-bit MetaFrame would be very, very useful.
So, fill out that survey and let your voice be heard!