[arch-general] How to convert a 32-bit system to 64-bit?

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>