This is a useful mod added to Tekkit that lists all the items in the game and their recipes, and provides the ability to spawn those download minecraft too many items in. Recipe view contains 2 functions, Recipes and Usage.
Once in recipe view clicking will bring up recipes and right clicking will show usages. Esc or Inventory key is used to exit. So the wool will change colour. Usage mode shows you all the recipes that contain that Item. And it shows shapeless recipes too.
If you show shaped recipies while using a workbench. Clicking on this button will return you to the main inventory wher you will see highlighted overlays in the slots prompting you of which items to put where. The Item Search Box is the black bordered rectangle at the bottom. Only items that contain the text in the Item Search field will be shown in the Item Pane.