Puredyne is targeted at x86 32-bit and 64-bit Intel and AMD compatible laptop and desktops machines. That include your typical PC laptop/desktop, atom based netbooks, Intel-based MacBooks, etc. Please note that for now, the USB booting is only for PC machines, and that you might require to install third party proprietary drivers to fully benefit from your wireless, sound and video hardware. If in doubt, ask on the Puredyne mailing list!
Minimum specs: Intel Pentium III 800Mhz with 384MB RAM.