A week ago I came across a guide showing the wiring to make some LED's show the CPU or HDD usage...andybody know where it is, i cant remember where i saw it.

Yea, I have actually made one, it works well. Here is the link you are looking for I believe: http://projects.pointofnoreturn.org/ledmeter/

http://www.casemodgod.com/ledmeter.htm

try that as well.