iPad: Adobe's three new Photoshop Touch apps are available for purchase from the App Store. Color Lava, Eazel and Nav interact with Photoshop CS5 on Windows or Mac, enhancing how you can interact with the program.
Here's a brief description of each (starting from the left and going clockwise in the image above):
Color Lava ($3.99) - an app for creating custom colours and colour themes by dabbing and swirling. Tapping a swatch on the iPad can make it the foreground colour in Photoshop CS5.
Eazel ($5.99) - allows you to fingerpaint on the iPad and mix "wet" and "dry" paint for realistic colour blends (the digital paint is said to "dry" over time). You can send your paintings to Photoshop CS5 directly or email them as JPEG files.
Nav ($2.49-) - use your iPad to activate Photoshop tools and select Photoshop documents. This one seems the most unique to me and a more intuitive way to work with Photoshop.
If you're a Photoshop user and have an iPad, you may find these apps very useful. Let us know what you think if you get a chance to try them out.