iPad: If you're looking to extend your keyboard's reach a little, Actions for iPad is an app that allows you to set up all kinds of actions to control your computer from your iPad. Essentially, it turns your iPad into something like AutoHotKey, but with boxes instead of keyboard shortcuts.
Once you download the app on your iPad, you'll send an email to yourself to download software on your computer. Then, once your iPad and computer are linked, you can set up hotkey actions on your iPad. This might be a script for Photoshop, text snippets, media controls or plenty of other things. Actions for iPad comes packed with a bunch of built-in presets, but you can also set up your own actions. It's a surprisingly useful little app, and once it's set up you'll be able to streamline a lot of your daily actions. Check out the the Actions blog for some ideas on different shortcuts you can set up.
Actions for iPad ($4.49) [iTunes App Store]