Selling my brother's Celeron D 346. It has been through medium use for about one year until I upgraded him to a P4. Great proc for a basic build, decent benchmarks for how cheap it is. It played Lego Star Wars II at high settings just fine. Also a cheap way to add 64-bit compatibility to a system. It runs cool, too.
Here's some info on it:
Intel® Celeron® D Processor Numbers
Check Google for benchmarks
This is for the chip only, no hsf. Asking $22 shipped. Paypal or MO accepted.