Khalids Islamic Art Homepage (Comprehensive)
Sakkal Calligraphy Homepage Commercial
DIA: Galleries: Ancient Art - Islamic Art
Ali Al-Bedah (Islamic Art Page) - Kuwait
Very beautiful!
Abrar's Islamic Calligraphy Page
Farzana Jilani's Homepage
A nice page by a sister
Mohammad Abdul Halim's Nice collection of scenery images related to Islamic Topics (not calligraphy)