The 60 mins app is well worth it. It's $5 and you can see any number of 60 mins eps. It also has a lot of Andy Rooney's commentaries. I've used it a lot.
I'm not sure if there is an iPad version, but for phone I have been using the Jew or not Jew app. It's a database of jews so you can tell who is a jew while on the go. It even has a random jew feature where you can identify jews you might not have been aware of before.
There is a Game of Thrones app that's just a searchable list of all the chars and houses in the book series. A good app to have if you read the series since there is an endless amount of both that get referenced constantly.
What's On makes it easy to know what is on TV.
iRugz is a rug marketplace. Great app if you are in the market for a new rug. It shows vendors, prices, pics ect.
Weber's "On the Grill" is a great app if you grill a lot. Well designed and written, with plenty of pics. It also has nice attention to detail. If an instruction says something like "grill for 9 mins" then it will be a link, and if you select it, it start a timer for that amount of time.
Fotopedia has an app simply called "North Korea" thats a collection of pictures from NK. It's nice to look at.