migration to 64bit ?

[' =JeffH ']

I've been reading through the various 64bit threads with interest. I'm on a 
core2duo machine, presently running 32bit.

My overall question is what are the (detailed) steps would one take to migrate 
a system from, say, 32bit Ubuntu 8.04 LTS ("Hardy Heron") to 64bit Hardy?

My video card is nVidia, and it appears they have a 64bit linux driver. As 
threads here have indicated, there is now 64bit support for Flash, Java, etc. 
So those main items are apparently addressed.

One item that hasn't really been discussed is virtual machines: I presently 
use vmware v6 to run at least one guest OS (winXP), and sometimes linux VMs. 
In looking at VMware's site, it seems that they've had 64bit support for a 
while now, and one can run 32bit guest OS's on 64bit host OS's, so that 
appears to be just a matter of downloading the x86_64 installer, yes?

So, if one has a functional 32bit Hardy system, what are the machinations to 
make it become 64bit?

thanks,

=JeffH