I've read a couple of articles that mention the product and was looking for more shared ignorance. :P They've been getting some good press lately, I just don't know as much about them as, say, Vonage or Packet8. Their main product seems to be a USB stick w/ the software loaded on it, so you can access the softphone from any computer. You can also download the software online (although I've had trouble getting it through Norton Security) or they have a phone adapter for $70.
A couple of key features that seem to be missing are the ability to have virtual numbers (different area codes that ring to the same place) and a business-class PBX option w/ extensions, transfers, etc.
They do have this really cool feature where you can setup your landline or physical phone number, then use VoiceStick as a relay to make long distance calls. So if the area code of your VoiceStick line is local for your landline, you just call your VoiceStick number, it picks up the caller ID, then directs you to enter the number you want to call. This is also helpful for a SOHO if you want to have the caller ID be something other than your home line.
I've had it about a week now and it seems to be working very well. We traveled out of town this weekend, and the people we stayed with had no cell coverage in the house, but they did have wifi, so I was able to make several business calls from the laptop using the softphone and without using their long distance.
Also, I just found this little adapter from Radio Shack that lets you use your cellphone headset on your computer, so you don't have to lug around a separate headset or mic.http://www.radioshack.com/product.asp?catalog%5Fname=CTLG&product%5Fid=42-2428