Political Books

The site has books on political subjects mainly (auto)biographies of such political leaders of Pakistan as Zulfiqar Ali Bhutto, Syed Yousuf Raza Gilani, Nawaz Sharif, Javed Hashmi etc.
Go to: http://books.pakistan4ever.com/

Islamic Books

A number of Islamic books by Dr. Israr Ahmad.
Go to: http://www.hilalplaza.com/pakistani-urdu-e-books.html

UUrdu Dost DIgital Library

The site has an "Adabi" mahnama named "Kaynat". Every month, an episode of a novel is presented. Besides quizes, radio, screen savers, wallpapers, photogallery and directory etc. all in urdu, the site has a free urdu library which contains some good books. New books are constantly added to the library.
Go to urdudost digital library: http://www.urdudost.com/

KitaabGhar

Kitaab Ghar; Free Urdu Books, Mystery Novel, Crime, Islam, Quran ...
kitaabghar.com is the 1st and largest online archieve of urdu literature and free urdu books like Islam Books, Mystery Novel, Crime, Islam, Quran, Shayeri, ...
It's one of the best urdu novel and short story site I've ever visited. Books to be viewed online. Also available for download.
Go to http://www.kitaabghar.com

Allama Iqbal Urdu Cyber Library Network

This site claims to be the largest urdu website in the world. In fact, it is. A large number of urdu books are available grouped under various headings. Categories inlude books of Allama Iqbal, books on Iqbal studies, Islamic books, books on pakistan studies, poetry, fiction, novels, afsane and on various other topics. Books are to read online in the browser. No downloads.