Now this is exactly the reason I love my phone. When I come across apps like this it just makes my day. The FREE version is awesome IDC about waiting 20 seconds to get to vm without ringing the users phone while listening to an ad I put it on speaker wait to hear the message is done.
This is an application that once installed allows you to pick a user out of your contacts to call and skip straight to their Voice Mail instead of ringing the phoneline to answer. I've tested it allot over the course of the past week and it works just great I love it
http://www.slydial.com/index.php
You can install the app via a text link or download the cab or you can even just call into the service from any landline or cell and use it as well for free