Autograph is an example of an app that does only one thing, but does it brilliantly. All Autograph does is allows me to sign things on my computer. A simple press of a universal shortcut causes a window to pop up, inviting me to sign my trackpad. I sign the trackpad, press return, and the signature is inserted into whatever I’m working on.
That is all it does. There are other, less elegant, solutions to this problem. I could have a scanned and stored JPG of my signature which I would import into a document as and when needed. But this solution is so simple and so elegant that it’s worth the couple of quid the app costs.
Check out their website, and see if you wouldn’t find a use for Autograph. I really recommend it.