My Favorite Developer Powertoys

Chris Asks:

I just now discovered the Power Toys link and I am very excited about learning more. I am interested in NUnit and I plan to check out the NUnit Add In. What are some Power Toys that you like in particular? Or what would be good ones to start out with? Thank you so much and have a great day!

Personally I use:

I also would be a big Nunit+Add-in fan if I were developing my own software more than I am right now. 

What are your favorite tools that are, or are not, currently listed?