I'm learning C# via the "Essential C#" Lynda.com video tutorials and plan to read a couple of books that cover things in more depth afterwards. My question is where I should head to learn more after that? I've done things like project Euler in the past, but I find they don't really help me learn anything other than basic program control flow and features.

I've looked at many open-source projects but pretty much everything still looks overwhelmingly complicated at this stage. What would you recommend I look at to help me build useful applications that are a bit beyond the millions of console applications I must've written thus-far? Should I be looking at books specifically on learning/working with the .NET framework, or just biting my lip and continue working through open source projects until they start to make sense?