Cloud Formation
Cloud Types Part 1
Cloud Types Part 2
Cloud Classification
Pictures
There are some links to cloud pictures:
Stratus
Stratocumulus
Nimbostratus
Altostratus
Altocumulus
Cirrus
Cirrostratus
Cirrocumulus
Cumulus
Cumulonimbus
Lenticular!
You can go to Wikipedia for more information about clouds!