I'm upgrading my 1st gen CD mini to get a couple of more years of life out of it. I ordered a T2700 2.33 GHz Yonah off of ebay for $188 shipped. I'll let you know when, if, I receive it and whether it works. AFIK, the CD mini's only take upto 2 GB of ram. It'll be great if someone figures out how to flash the CD mini with C2D mini's firmware. I also ordered a Hitachi Travelstar 200 GB 7200 RPM HD (newegg $150 shipped after rebate). The combination of the faster CPU and HD should significantly boost performance of my 1.66/2GB/80GB/CD mini.
Wow, that's gotta be one fast mini! Unfortunately you didn't get a T7600 chip, which has double the cache (and double the price!) Enjoy your purchase anyway! Your mini is faster than my MacBook Pro