I mostly watch for Excel and VBA related questions. I regularly check for questions with no answers that are a couple hours old. In the Excel realm, I love automating charts and data analysis. I also work in C# and have enough experience with Excel Interop to be helpful.
Over the years I have collected a large amount of utility code that I use regularly. I combined that code into a proper add-in and am actively developing it. I call it bUTL and put it on GitHub recently.
Check out my Excel blog.