iOS (Jailbroken): It's not easy to edit text on an iPad — you have to hunt and peck awkwardly on the screen to make a selection or place a cursor. SwipeSelection is a simple jailbreak tool that adds gestures on the keyboard that make navigating text easy.
SwipeSelection is based on a concept video created by Daniel Hooper, and its implementation is similar. You can slide one finger around on the keyboard to change the cursor location, or hold shift and do the same thing to select a block of text. It doesn't seem like much, but it makes the cumbersome task of editing text on the iPad considerably easier. SwipeSelection is a free download, and you can find it in the Big Boss Repository.