Even if you don’t have back-door access to your nearest ultrasound lab, you can, in fact, take ultrasound snapshots of your baby every week (or even every minute!) with one of these awesome DIY cellphone USB ultrasound system. Okay, I admit, it looks more like a vibrator here but lets now forget it is an ultrasound on your cellphone, this IS a great idea for cheapening future costs of taking ultrasound scans.
The power of a modern cell phone is changing how many things are done today. For example I recently heard that the once CPU taxing program Myst was now available for the iPhone. I think I had to upgrade my video card to play that game years ago. Thanks to a Microsoft grant some software was developed to display data from a USB Ultrasound device. This technology allows for cheap portable medical diagnosis. See the full presentation here (PDF).