Launch Center Pro for iPhone was released yesterday and while it has actions for many of the apps I use, some of my apps have extra functions not directly revealed by Launch Center Pro.

With a little bit of trial and error I've found some extra things you can try with the Custom URL action:

Articles

Open an article directly in Articles
wiki://en.wikipedia.org/wiki/[prompt]

iCab Mobile

Open bookmark in iCab Mobile
icabmobile://www.server.com/

or via HTTPS
icabmobiles://www.secureserver.com/

Search Google with iCab icabmobile://www.google.com/search?q=[prompt]

Prompt

Connect to a server using Prompt
ssh://user@yourserver.com:22

Screens VNC

Connect to your server even if you don't use ScreensConnect
screens://yourserver.com?username=user&password=[prompt]