Even if FCPX does support 32-bit systems, they're on the way out because they're not supported by Lion. I just upgraded my ancient Core Duo laptop because of this.
My software:
Pro Maintenance Tools - Tools to keep Final Cut Studio, Final Cut Pro X, Avid Media Composer and Adobe Premiere Pro running smoothly and fix problems when they arise
Pro Media Tools - Edit QuickTime chapters and metadata, detect gamma shifts, edit markers, watch renders and more
More tools...