Check out APress’ Free ebooks page. there are currently 5 Ebooks available to download as PDF format for free. These include “COM and .NET Interoperability“, “Programming VB .NET: A Guide For Experienced Programmers“, “Writing Perl Modules for CPAN“, “Dissecting a C# Application: Inside SharpDevelop” and “A Programmer’s Introduction to PHP 4.0“. Very cool!