Reference E-books for Development Works

I stumbled on this website as I was looking for free programming books (in e-book format):
http://www.freeprogramminge-books.com

I was searching for articles, references specific to the .NET Framework and I noticed the site has a vast repository of references for other programming platform also.
I was able to download ebooks on the following:

The Art and Science of Web Design by Jeffrey Veen
Microsoft patterns & Practices: Design and Implementation Guidelines for Web Clients
Microsoft  Building Secure ASP.NET Applications

I have yet to squeeze in the time to catch up on some reading but it was a relief that there were these articles available.
There are other sites which has free ebooks, but these are what I have uncovered for now...

Anyhow, it was a relief to have stumbled unto this coz this can be a great help whenever I'd be needing to look for references.