Here is a list of the most useful apps I have on my iPhone. I can't remember which are pay and which are free. I admit to having blown at least $50 on apps thus far.
- WeatherBug -- the UI isn't so good, but the forecasts seem to be accurate.
- Twitterrific -- I tried a few twitter apps, like this one the best.
- FaceBook -- well, it works. Sometimes very slow, and seems to re-present old info at times, but there isn't any alternative.
- eBay -- handy on occasion, when bidding on things.
- Shazam -- ID's popular music easily, has come in handy a couple of times
- TnL -- Thunder and Lightning. Calculates the distance the T-Storm is from you, based on specific air temp and when you saw the flash and then heard the thunder. Used this app precisely once, during the Thunder Snow a few weeks ago, and it impressed the wife greatly.
- aSubnet -- handy IP subnet calculator, but I don't have to use it that much anymore (know mostly by heart).
- Save Benjis -- shopping comparison tool. UI kinda sucks, but it has found things for me when needed.
- fring -- SIP VoIP client (and other stuff) for the iPhone. I have used it to make a couple of calls over Wifi. Might use it more in the future.
- Pingamajig -- handy IP ping tool, with history and multiple host support (to check quickly if servers are up or down).
- Ping -- another IP ping tool, simpler interface
- TouchTerm -- SSH client for iPhone, has been handy a couple of times when I was desperate to fix something and had no wifi or no laptop handy.
- Speed -- displays your current ground speed thanks to GPS technology.
- NetNewsWire -- decent RSS reader. Need to update my feed list.
- TideApp -- high tide/low tide calendars
- Chopper -- nice helicopter rescue game with classic arcade game feel, controlled with the tilt sensors. Hours of fun.
- Drinks -- bar drink reference
- Firedrop -- surprisingly difficult "tap" game, sorta like a weird inverse tetris. Still have not beat it.
- Loan Calc -- solve for various variables on a loan or mortgage, and compare between two. Was handy at a school board meeting.
- FlyCast -- streaming radio stations. Works pretty well.
- Asphalt4 -- very nice street racing game, with tilt sensor controls, lots of maps and cars. "state of the art" for iPhone games.
- WhiteNoise -- generates various sound patterns, useful for sleeping or resting.
- Constitution -- the complete United States Constitution with all amendments, with good educational notes.
- i.TV -- very nice TV schedule app, also provides movie trailers.
- FreshBooks -- iPhone client for the FreshBooks web-based time and billing service. Extremely useful to me.
- Tap Tap NIN -- Nine Inch Nails edition of a "rock band" type game. Very nice.
- Google Earth -- portable goodness, but slow.
- Ocarina -- turns your iPhone into a digital whistle (blow into the mic), and share/hear tunes others play around the world. Neat.
- TapDefense -- a nice tower defense game. A big time sink.
- 7CitiesTD -- a very fun and polished take on the tower defense meme, and another 'state of the art' iPhone game. Another big time sink.
- WiFinder -- get detailed info about Wifi networks in range of your iPhone.
- Joost -- stream videos from Joost. Can be used to watch TV over Wifi and drain your battery very quickly.
- Air Sharing -- turn you iPhone into a web accessible document store. Handy.
- Koi Pond -- touch sensitive fish pond. My standard demo app for people who want to play with the iphone for the first time.
- Remote -- Apple's official remote control for the AppleTV. Very nice to be able to control music playback from anywhere, and wonderful for entering text compared to the point and click method with the IR remote.