BlargOC has just posted a review of the popular DigiDoc 5. It allows you to monitor temperatures within your system continuously. here's a snip:

"Since I got myself a larger case and more fans I have always fancied one on these devices. I dont really like having ll my fans in my case running 24/7 and therefore would love to be able to trun them all on and off when I want. I have looked at various Baybus and Fanbus designs on the net but to be honest I have never trusted myself enough to do it, last thing i need is to blow my PC up."