It would be great to have a series on Domain Driven Design with some code showcasing the benefits of the approach.

http://msdn.microsoft.com/en-us/library/aa480021.aspx

Offering an API for Web apps has become the norm. How to design and develop an API that for example returns RSS and JSON will help developers create and offer competitive applications and services.

From detecting spam to predicting price changes, machine learning is all around us. Understanding how machine learning works & how you can use it in your own applications has become an invaluable skill. Stanford University's Professor Andrew Ng says that they have far more requests from companies who need people who understand machine learning than Stanford can produce. http://www.ml-class.org

Like many other developers, I am in a position where I have moved more to an architect role without any formal training in the arena of networking such us trusts, load balancers, DMZ's, VPN's etc. I'd love to see a course that covers the topics that as developers we fear we may not understand as well as we should and that can fundamentally influence our solution design.

Mr. Allen provides very good lessons and I would like to continue learning C# using his lessons.

Can you post video series on UML Design

A course on the use of angularjs for web development would be very interesting.

Organization, patterns, and best practices like abstracting your base framework from your core scripts.

As aspired to be Ethical Hacker, or even as developers, I think it would be nice to have courses about all this topic of information security.
It includes subjects like SQL Injection,Attackers thinking, Social Engineering, Brute Force, Wireless Hacking, Sniffing and and so forth - subject of the CEH (Certified Ethical Hacker) diploma.
I think that nowadays, hacking (basics and advanced) is an issue that every IT professional (include developers) should be revealed to.

Please post video series on Database Design

I would love to have a course on Python Development and differences between cpython, jython, and iron python.

When we are designing and developing a solution for the cloud, we also should take into consideration its availability, resilience, responsiveness and performance. It is also important that the application expose its health and its resources's capacity so that it could be easily integrated with solutions such as Microsoft System Center.

Guide with real examples of using jQuery plugins in MVC for everything from simple watermarked textboxes to complex treeviews etc It should demonstrate with code using jQGrid or others that are available etc.

This code should ideally cover all the common UI elements.

Course introducing Hadoop, Map and Reduce, Pig and Hive

Using BDD (maybe a tool such as SpecFlow) with the cucumber language.

Can post vedio series on Integration of Payment Gateways(credit/debit) in websites

Looking at all aspects of working with OAuth in .NET and web applications. Including implementation of a custom OAuth end to end solution

Secure coding is something that is getting more traction in industries that deal with sensitive data. I'd like to see a course covering code vulnerabilities and how to mitigate them...

http://www.sans.org/top25-software-errors/