How to convert a 32-bit system to 64-bit?

[Lauri Niskanen <ape@xxxxxxxxxxx>]

I have a working 32-bit Arch Linux server. It's more like a testing 
playground than a production server. I decided to convert it to a 64-bit 
system.

I could reinstall Arch, but is there any easier way to do the "upgrade"? 
I'd like to retain my list of applications, configuration and user files.

--
Ape <Lauri Niskanen>