For anyone who might start riding on a regular basis, you should definitely buy a phone mount for your bike. I bought an Arkon. This mount works really well. It was easy to install and it stays put. You can rotate it in either landscape or portrait mode. Here's what it looks like.
Screw the base to the handlebar-
Attach the phone holder-
Snap the iPhone into position-
Front view-
The mount is a must have for bike riding. It keeps the iPhone off of me and in plain sight. Easy to change the music or read emails while I'm riding.
The next must have is an app for tracking your ride. I bought Cyclemeter. I picked this app because at the time, it was the only one that worked with multitasking. Its a great tool. The app tracks my speed, calculates my distance and even tells me how many calories I've burned. When I'm done riding, a woman's voice starts speaking and tells me all my stats. It also sends me an email showing me a map of my ride. I can even use this when I'm jogging. Super cool app!
Here's the map that was sent in the email.

Lastly, I bought the S9-HD bluetooth headset from Motorola. This headset is nice except for the ear bud design. One of the rubber ear buds keeps falling off when I carry it around. Once its snug in my ear it doesn't move. The HD sound quality is great and best of all, there's no wires to get tangled in. I don't think its legal or safe to ride with these on but I'll leave that up to you to figure out. Here's what they look like:
I'm happy with everything I've bought for the bike so far including the gloves and riding shorts. Soon I'll be buying cleats to help pedal more efficient. I don't really want to but, after almost getting hit twice today, I think its best I buy a helmet.
_Vince