Arshi's Urdu Page
Standarization of Urdu Code Language Page (spot the error in fig. 1 -qaaf should follow fay-)
Another collection of Urdu-links
Urdu Language Resources
Urdu Dictionary
Another Urdu Dictionary
English to Hindi Dictionary (Use Mozilla)
Urdu Dictionary by Dinesh Prabhu
one more Urdu Dictionary
Platt's Dictionary of Urdu, Classical Hindi and English
Ukindia's Learn to Read Urdu
List of Urdu Teaching Books and Dictionaries with Comments
There is a nice Urdu alphabet trainer here
U-trans: a little freeware program for creating Urdu web pages, developed by Tabish Qureshi. It is best used with the Urdu Nastaliq Unicode font developed by Shehzad Ali.
Some useful sources on Hindi/Urdu language and literature