SIL Unicode fonts Scheherazade works really good
Arabic fonts for Mac
Accordance Font new Unicode font
The Brill Unicode font but beware of usage restrictions

http://ejtaal.net/aa Great resource for comparing the best lexicons at the same time syncing pages by root

Lane's Lexicon online (Tyndale House)
Lane's Lexicon online with color coded entries; still in development (Quranic-Research)
ArabBible - Arabic Bible software for Windows, Mac. Includes translation, grammatical analysis, and other features.