http://www.twistedmods.com/modules.php?name=Sections&op=listarticles&secid=1 http://www.metku.net/index.html?sect=mods http://www.madshrimps.be/?action=hwfaq http://www.ocaddiction.com/articles/ im new myself to modding and i find reading over the things on these sites to be very helpful
I'm sorry to tinkle on the cake so to speak... but you know there is a wonderful thing called search.... failing that google... Dispite my cynicism simple mods are relative to your skill level... usually people start by stealthing drives changing LEDs, making convenience mods eg relocation of audio IOs, and windows etc...
my first mod was a glow pad... its a good start to work with the tools and learn some electronics and stuff.......... they have a guide here, and they have one at metku.net (great site) .. .. but seriously.. just play around with stuff ya got laying around the house.. take it apart, put it back together and make it look cool.
Just read read and read that is the best way! findsomething you like and run with it. Just a word of caution from experiance dont do something to far above the level you know your own becaus you will most lily make an expensive mistake, I know I did.
Here's a good simple mod. If you have a light in your case, put a switch on your front bezel to turn it off. Nice, simple, useful and easy to do.