I just got
Instagram today. It seems cool so far. You can add filters to the pictures you take.
Southwest Airlines has an official free app. You can check in from your phone at the 24 hour mark to get that A boarding pass! You can print later, even from the airport kiosk. I checked into a flight from Pecos Bills last year.
The
Kindle app. You can then download free (or cost) Kindle books from amazon.com and they will go straight to your phone, or you can download books from the phone.
Redbox has an official app. You can reserve movies from your phone and then go pick them up from the kiosk you designate.
SparkPeople has an official app. SparkPeople.com is a free website that has food journals, activity journals, and community boards for weight loss. The app lets you track your food intake.
Facebook has a free, official app. It's froze on me multiple times, though. Like the rest of Facebook, it's great when it's working...which for me lately is rarely.
AT&T has an app to check my usage information. I'm sure most mobile carriers have this.
Chase bank has an app to check my balance. I'm sure most banks have this also.
ESPN Score Center. I can pick my favorite teams and set it to send me score updates during the games my teams play.
Most news sites have free apps. I have one for 2 local news stations. One even sends me breaking news.
If you have a trip coming up, I think most airlines and shuttles and hotel chains have apps also. Those might be good for those specific purposes.
I have the free
Angry Birds, but also ended up buying both regular Angry Birds and Angry Birds Seasons. I think they are 1.99 or 0.99 each.