My contract is up for renewal in a couple of weeks and with at&t offering the Iphone for 49.00 I am going to grab one. What are some of the good app's that you use for cycling?

$49 is a good price. I'd give thought to the Verizon model though. Some of my friends having AT&T do not have complimentary things to say about the reliability of the network.

As far as apps, the one I've been using the most lately is a GPS app called "GPS Kit". I like it a lot for tracking my hikes and rides. I actually bought and tested four or five similar apps, and GPS Kit is the one that I ended up with as my go to app.

I've got a bicycle-specific tracking app too, but I never use it.

There are various apps with repair instructions, but I already know how to make repairs, so I did not buy any of those. They do exist though.

For me, the GPS application has turned out to be the "killer app" for the phone. Anywhere there is a signal, I can hit the button and pull down terrain maps for the location. And I can cache apps for my local area, so that I don't need to be in range of a cell tower to use the GPS feature. The phone is not a bet-your-life GPS device (no device is, really), but it sure is convenient and fun to have as I explore.

Wobble and Pull My Finger are great apps.

Two good cyclometer apps are B.iCycle and Cyclemeter. I used both and they worked well. For a number of reasons (battery life, data roaming charges traveling to the EU, no cadence, no heart rate, weather resistance, etc.) I got a Garmin 705 so quit using those.

Cyclemeter +1

I'm partial to Runkeeper

I am curious to know how much cyclemeter use the 3G bandwidth. I have an iphone from work and have some monthly limit of 3G usage before it hits overcharge.

I commute 32miles daily round trip. Any idea how much KB (or maybe MB ) of 3G data transmission?

Thanks - Nono

Nono, can't tell you. I have an unlimited data plan and haven't bothered to check. Next time I use it (this weekend on a 32 mile charity ride), I'll try to determine what the usage was.

You can turn data off and still use Cyclemeter. It will depict your track, but just won't depict maps because it gets them from the web. However, if you scroll over the course before you ride when you have a data connection (perhaps wifi) , it caches the maps for the course at the zoom level you use and you'll see those parts of the map even without a data connection.

MapMyRide / MapMyRun uses Google maps to plot and measure your routes.
Don't have an iPhone so cant comment on how well it works so I just use it on my PC.