Review on the book "The Best Software Writing I: Selected and Introduced by Joel Spolsky"
The Best Software Writing I: Selected and Introduced by Joel Spolsky, published by Apress, in June 2005.
In this book, Joel Spolsky selects close to 30 articles covering a variety of software related topics with his introduction to each of them. If you have enjoyed writings by Joel Spolsky and Paul Graham, you will find out some other writers who may be of interest to you from this book.
In general, most of the writings are available online as they were written around the 2003-2004 time frame and published online. So after initial reading, you can continue explore the authors' web site and check what they have to say now.
You can also check the links to the original sources of Sposky's selection of these writings compiled by Neil Kandalgaonkar.