Way back at CES we got our first glimpse of RIM's Visor Mount Speakerphone and saw about a week back that it was listed as "coming soon" on the BlackBerry website.  I have been playing around with the Jabra SP700 Car Speakerphone which is an overall great device, and from what I can tell very similar to the Visor Mount Speakerphone.  The Jabra SP700 sells at ShopCrackBerry.com for $79.95 and is well worth it.  Not only does it allow you to use it as a speakerphone in your vehicle, but it also acts as a Bluetooth gateway, allowing you to play music through your car stereo speakers.  Check out the video for a quick walkthrough, and head over to ShopCrackBerry.com to pick one up for yourself.