ok i know it sounds really simple but the easiest way for me is to add an alpha channel> use the path tool go around what i would like to cut out>selection from path>select>invert>del and i have my cutout, but they dont always come out like i had hoped, i have been practicing awhile and they have been getting progressively better. but i deleted all of my pictures and some of my programs because my laptop was running slow so im back to ground zero. any help/tips to making the renders better?
thanks
-scgimp

Don't limit yourself to one technique. The Path Tool works well in most situations, but the Fuzzy Select can sometimes be quicker and do a better job with complex edges. Personally, I prefer to use a layermask rather than cutting out selections (painting black the area to be removed) -- this permits easy recovery if I accidentally remove too much (just switch to painting with white).

Also, consider creating a new display (View->New View) and using the Contrast Display Filter to enhance the edges of your render.

In addition to what Saul says above:

Recently, Rod submitted a post about some pdf files that contained some interesting GIMP tutorials.

See viewtopic.php?f=10&t=253&start=0&hilit=lxf_gimp_tutorials#p2068

Particularly, LXF 111. (I've attached this pdf below)

thanks, will try it out