Simple Diagramming App for Mac OS X.
Shapes is a simple, elegant Graphing and Diagramming app for Mac OS X Snow Leopard. Shapes gives you all of the most important features you need in a Diagramming tool without all the extra cruft, and without breaking the bank.
Shapes is great for Programmers and Web Designers looking for a simple tool for rapidly designing Charts, laying out Wireframes, or visualizing Model Relationships.
Shapes lets you get to work quickly by giving you just the basic tools you need in a slick, single-window, thoroughly Mac-native UI.
Bonus: Shapes also offers Full-Screen Mode. Woo!
Visit http://shapesapp.com to download a free, feature-limited trial version before you buy!