Engine Organizing Rated 4 out of 5 stars
A fantastic idea! Just one other extension permits multiple searches, but it's clumsy as hell. I paired this with All-In-One Sidebar and it completely changed how I search the net. Wonderful!
Just one thing I wish you could reconsider. Categories are a bit limited. Choose a category and you lose the ability to see other search modules. Why not use a tree structure like the left pane of Windows Explorer instead? Create custom folders then drag and drop modules. Expand or collapse and choose as you wish. Seems more flexible, no?