Magma Effects is a clever plug-in for InDesign CS and CS2 that allows a number of Photoshop-like edits to be applied directly in InDesign.
Former Suitcase users will feel much more at home with the interface than Font Reserve users; however, Reserve users will quickly become familiar with the easy-to-use interface.
If you like to experiment with designs and effects in Illustrator, you should check out these plug-ins.
Plug-in makes palettes transparent
InDesign plug-in bundle automates advertising workflow
Writing and editing program streamlines editorial workflow