Chrome only: Bookmarklets can do wonderful things, but hunting for them might not be your cup of tea. SpellBook combines bookmarklets into a right-click menu you can trigger from any page, so you can Instapaper, Evernote, link-shorten or otherwise act on helpful stuff.
Install SpellBook, and right after it loads, the extension creates a "Bookmarklets" folder on your bookmark bar. Drag any bookmarklets you already have, or run across, into that folder, and they're listed whenever you right-click on page and hover over the SpellBook menu. It's simple, convenient, and might serve as a lightweight substitute for many of your Chrome extensions.