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Sockets (and WinSock) Programming
TCP/IP Illustrated: Protocols v. 1: The Protocols (APC)TCP/IP Illustrated: Protocols v. 1: The Protocols (APC) by W. Richard Stevens
Buy new: £28.96 / Used from: £19.99
The "Bible" of TCP/IP, part I
TCP/IP Illustrated: The Implementation v. 2 (APC)TCP/IP Illustrated: The Implementation v. 2 (APC) by Gary R. Wright
Buy new: £31.37 / Used from: £29.65
The "Bible" of TCP/IP, part II
Effective TCP/IP ProgrammingEffective TCP/IP Programming by Jon C. Snader
Buy new: £27.19 / Used from: £16.72
Very handy guidance on TCP/IP programming, gets used a lot
C++ Network Programming: Resolving Complexity Using ACE and Patterns v.1: Resolving Complexity Using ACE and Patterns Vol 1 (C++ in Depth)C++ Network Programming: Resolving Complexity Using ACE and Patterns v.1: Resolving Complexity Using ACE and Patterns Vol 1 (C++ in Depth) by Douglas C. Schmidt
Buy new: £15.84 / Used from: £19.15
OO and Networking using the ACE library, part I
C++ Network Programming: Systematic Reuse with ACE and Frameworks v. 2 (The C++ In-depth Series)C++ Network Programming: Systematic Reuse with ACE and Frameworks v. 2 (The C++ In-depth Series) by Douglas C. Schmidt
Buy new: £21.77 / Used from: £20.00
OO and Networking using the ACE library, part II
The Ace Programmer's Guide: Practical Design Patterns for Network and Systems ProgrammingThe Ace Programmer's Guide: Practical Design Patterns for Network and Systems Programming by Stephen D. Huston
Buy new: £30.65 / Used from: £26.81
An intro to the ACE library
Network Programming for Microsoft Windows (Microsoft Professional Series)Network Programming for Microsoft Windows (Microsoft Professional Series) by A. Jones
Buy used from: £4.58
Networking on Windows - good guidance on model to use, very useful
Windows 2000 TCP/IP Protocols & Services Technical Reference Book/Cd PackageWindows 2000 TCP/IP Protocols & Services Technical Reference Book/Cd Package by Thomas Lee
Buy used from: £0.99
Lower level detail for Windows
Windows System Programming (Addison-Wesley Microsoft Technology)Windows System Programming (Addison-Wesley Microsoft Technology) by Johnson M. Hart
Buy new: £28.45 / Used from: £25.00
Contains some Sockets stuff for Windows
TCP/IP Sockets in C#: Practical Guide for Programmers (The Practical Guides)TCP/IP Sockets in C#: Practical Guide for Programmers (The Practical Guides) by David Makofske
Buy new: £12.79 / Used from: £8.77
Doing Sockets in C# - gentle introduction, best for people who already know Sockets and are moving from another language to C#
Java Network Programming (Java (O'Reilly))Java Network Programming (Java (O'Reilly)) by Elliotte Rusty Harold
Buy used from: £4.20
Sockets in Java
Java-NIOJava-NIO by Ron Hitchens
Buy new: £13.90 / Used from: £18.40
Java NIO - how on earth did Java get to 1.4 without this functionality? Mostly covers the select() model. The author rambles (waffles) a bit.