Try here.

Here's a tutorial I like a lot
http://www.seb4d.com/tutorials/Mattepainting/mattepainting_english.htm
http://www.seb4d.com/tutorials/Mattepainting_hivers/mattepainting_hivers_english.htm
another tutorial
http://cg-india.com/tutorials/photoshop/photoshop_tutorial_mattepainting.html

Gnomon offers a DVD
http://www.thegnomonworkshop.com/dvds/cst01.html

some matte artists I like a lot
http://henrik.cgcommunity.com/matte.htm
http://www.dylancolestudio.com/index2.html
a youtube video from Dylan
http://www.youtube.com/watch?v=pOKoSqTOUKI
http://www.dusso.com/pages/mp02.htm
http://www.capturefx.co.uk/

The father of matte painting
http://www.bonestell.org/

Talent is God's gift to you. Using it is your gift to God.