Tutorials and Tips > After Effects >
(Update – Newer versions of After Effects have keylight already included)
Here is a tutorial covering the basics of keying using keylight in After Effects 7. If you want something that gives you the best green/blue screen keying in After Effects, then in my personal opinion keylight is it.
Here is a tutorial showing the use of Block Dissolve to create several clips fading in/out on a grid (You will need 9 movie clips).
NOTE: This tutorial is intended for PAL, if you use NTSC some of the numerical settings will need to be changed!