Here's a peak:
In the fast paced world, we’re constantly trying to improve our productivity, but it can get hard when you’re on the move. We’ve compiled a list of mobile productivity tools that are accessible through WAP enabled sites, mobile download applications, voice, and SMS integration. Some of them use web applications while others are standalone, but they all help you stay productive while on the go.
There are a few great services that I had never heard of, like:
scanR - Use your mobile camera phone to scan, copy and fax. Copy documents, white boards and business cards and extract the text. Awesome! Try it!
pinger - Point to point voice messaging.
Callwave dictates your own voicemails and sends them to you via SMS and is free. I'm still looking for a service that allows me to send sms to others with my voice.