You get the Resharper demo, but it expires after a time. I have the Pro Power Tools, which are the best I've installed. I really like indent guides. I also have the color theme editor, but keep coming back to the default color scheme. I also have Method Block Highlighter and Code Map, but still figuring out if they are useful or not.

>Thanks for suggestions. I have a few of those add-on installed. Have you found any that you find useful?