how about tutorials or kits to make guitar amps and effects?
Good idea - unfortunately, we don’t have a clue how to do audio. 
National Semi has some crazy stuff for hand held devices. Almost 2W on a 5V supply. Unbelievable.
check our AVR projects page http://www.olimex.com/dev
IIRC there is Guitar tune project with AVR microcontroller
Tsvetan
do you know how to take in audio and process it to make a new sound and then lets it out through a speaker?
Malachai, I’ve got your back…you ever been to http://www.smallbearelec.com? They do specifically guitar effects (parts and all) have fun!
Just a little FYI - Small Bear mainly sells the components that the other websites develop the circuits for, but they do have a couple of projects of their own. Check out these sites if you want to go deeper into the effects stuff:
http://www.generalguitargadgets.com
These are all really good sites. I think either AMZ or DIY Stompboxes have pretty decent introductory projects for you to start on. Small Bear has kits for all of these sites’ projects as far as I know.
One other place that has a little guitar stuff is http://sound.westhost.com, AKA ESP. It’s mainly HiFi-type stuff, but there are some really great articles on there and he goes way in depth on all of the projects. A great place to audio noobs in general.