The specific question is about Fedora 13 on a Dell Precision M4500 with a Core i5 processor and only 4 GB of RAM. It will dual boot with Windows 7 which will be the 64-bit Win7. I understand that Flash and potentially Java have some problems with 64 bit Linux, especially that Flash has no native 64-bit support. Also, these are supposed to be solved problems from what I see. (Does anyone disagree?)
What other road blocks exist for 64-bit Linux, today? What about watching/editing audio or video? Drivers? Are there drivers that are supported under 32bit that are not supported under 64 bit? Or even vice versa for that matter? I know that most of user-space shouldn't care
Thus, the general question is: What can one do with 32-bit Linux today that cannot be done (or cannot be done easily) with a 64-bit Linux install? Is there any reason on a fresh machine to avoid installing 64-bit?