Glad someone dug up this old thread, because now I have some new apps to check out!
I'll look up both of those mentioned by TheBiles, and several of sparky's suggestions too.
sparky, I LOVE the App2SD app--and Google Sky Map was the very first thing my son (who teaches, among other things, the astronomy merit badge at scout summer camp) downloaded. I could just sit out in the backyard at night with that thing for HOURS.
I use my Flashlight app perhaps more than any other app I have.
I hadn't heard of GPS Test though, and don't know that I have a Voice Recorder (which I REALLY could have used yesterday!) so I'll check those out as well.
Another non-photo app that my son recently downloaded for me and saved me a TON of time was App Backup & Restore. It stores what I assume are little "setup" type files for all your apps, onto your sd card. I recently had to have my phone worked on, and the service tech said that they'd have to run an upgrade on it, and then I'd have to reinstall all my apps. I have a LOT of apps. I would have had to go into both Google Play Store and Amazon Apps and chosen each app and re-installed it. Instead, my son downloaded this app, did a backup of everything (which admittedly took a while), then they did their update (which didn't fix the problem, but that's another story). Then all I had to do was reinstall the Backup app, and go through and select which ones I want to reinstall (which was also a good opportunity to NOT reinstall some I never use)--and then set my phone down for about an hour while it worked on reinstalling all my apps.
Another non-photo app that I USE in my photography is the Audobon field guide apps. I have Audobon Birds and Audobon Insects & Spiders. Great way to try to figure out what little critter you've just taken a picture of! I think they are usually kinda expensive, but they often go on sale. I picked up the Audobon Birds as an Amazon Free App of the Day, and then got the other one for $4.99 a few weeks later (which is, by far, the most I've ever paid for an app!). Generally, about 90% of my apps are free ones, and the others are like 99 cent apps.