Software development company simpaddico has released PS Tips (free) and PS Tips+ ($1.99) for the iPhone and iPod touch.

Adobe Photoshop CS4 is a powerful tool, but to truly unleash its full capabilities, it's essential to know shortcut keys for common tasks. Stop poking around all of those menus trying to find what you need -- just use the shortcut key! PS Tips has databases for both Windows and Mac OS shortcuts.

The free version of PS Tips is just a teaser, really, since shortcut keys can only be viewed randomly. To search for a specific shortcut key (or scroll through the index of shortcuts), you'll need PS Tips+.

This app was designed with Adobe Photoshop CS4 in mind, but most of the shortcut keys presented in this app will work in other versions of Photoshop as well.