If you're using the stock Intel fans that come with the boxed Celerons and don't see the fan speed reported by lm sensors or whatnot, don't panic; the Intel fans lack the third wire which is necessary for speed feedback. Matthew Burke suggests www.overclockers.co.uk as a good source for cooling fans. [ed: Anyone recommend any others?]
Bill Cleaver reports that his system won't boot an SMP kernel using loadlin, the DOS-mode kernel loader. I don't have any other info on this, but if you have trouble loading a kernel with loadlin, you might try another boot loader. The FAQ author's favorite is GRUB, although the traditional LILO should work as well. If you're stuck without a way to load your system, you should be able to boot a UP kernel with loadlin.