Pintasking

Pintasking is an app that lets you pin any app that's installed on your device to your desktop, so you can keep it at hand and access it in just a touch. By default, these little buttons will stay fixed on the right side of the screen, but you can move them around if you want.

In the settings you can customize how your pins look and respond. The PRO version of the app lets you change their size, as well as their distance to the screen's edge. Other options in the free version stop them from sitting on the upper or lower part of the desktop, where they could bother you.

Pintasking is an interesting app that lets you keep your favorite apps at hand. This way, similar to the 'bubbles' in Facebook Chat, you can quickly access the apps you use most often.