I came across one that will only give a refund if un-installed within 15 minutes!! It's called Karaoke a-Go-Go Actually this is one of my favourite paid apps and does what it says. I also like: You Version; best Bible app I have seen so far. Tricorder........trekkies will know what this is. No Lock......works perfectly. Scanner Radio......I am here in Co Tipperary Ireland yet can listen to police chatter all over the world. I find I listen a lot to what's happening in NYC. Busy place.... Evernote. To me this is invaluable and syncs perfectly with the version on my laptop. For those who don't know it helps organise everything and anything that can be written down. I have more but I'd only be repeating many of the cool apps already mentioned in this great thread.