I thought the stock pano app on the 5 was quite good - certainly enough not to warrant an extra purchase. I haven't used it all that much, though..just enough to notice the camera gets a NASTY case of purple fringing when you shoot into the sun. No app can really fix that.
I like to use Logitech Touch Mouse with my laptop. It pairs with an app that runs on your computer and allows the phone to be used as a touchpad. Super useful when your computer is hooked up to the tv (streaming video) and you need to control the computer but are just too lazy to get up (me...Saturdays...football).
I've found the Google app pretty useful. You can use the Googles feature to take pics of products and identify them, check other prices online, etc.
CARR is a pretty useful traffic app for California people (perhaps TX has something like it). Basically, it lists all of the DOT-related road closures, construction, and chain controls. Useful if you're heading to Tahoe.
I use Dropbox for my cloud stuff...mainly that's just syncing photos between my Android tablet, iPhone and laptop.
Photoshop Express is useful if you want to ramp up the saturation on your photos so they look like the above panorama.
I'll play Drop 7 if I have a minute I need to kill.
Weather Underground app is awesome. Seems to be more accurate than the stock weather app and/or anything that Weather.com does. What I like best is that it has a map with several different overlays - radar, precipitation, temperature, etc, so you can visually see if one station's reading is totally out of wack.
DirecTV app is nice if you have DirecTV. You can record set recordings remotely. The latest version also allows you to watch live tv if you're in the same wireless network as the box is.
All of the above are free.