Respring is in the top ten list of apps that I have installed on my iPod touch. "That's stupid," you say, "all it does is restart the Springboard." But restarting the Springboard solves the problem some people get where the touch screen works on the Springboard, but not when in an app. I get this problem all the time, usually after I reboot (by holding both sleep and home buttons). I used to just reboot a couple more times, and the problem would go away, but that took a lot of time. Respring takes just one touch and a couple of seconds. And it solves it the first time, every time. Pretty cool.