Resharper : Don't develop with out it.
If you've ever seen my demo, you've noticed that I use and talk about Resharper a lot. I love it. It does so many things that enhance productivity, it's simply amazing.
Here is my favorite feature of the day.
Open Files. the myKB.com project has over 15 projects, and thousands of files. Navigating to them is a PITA with click, click, click. With Resharper you can turn on a feature called. Use Camel Humps.

With this feature turned on, you can find "things" (files, methods, properties) by just typing the upper case characters of the name. Watch this.
CTRL+SHIFT+N shows my a little data entry window for text input.

Typing SG ( for security group ) shows me, the files that match. With arrow keys, or more typing, it's very easy to get to the file your looking for.

VERY Helpful.