Since I first learned about Xtracycle, I have thought that it would be a great idea if bikes designed to be longbikes from the beginning (rather than have an extension bodged onto the frame of a shortbike) were available. However, it seemed such a niche market that I didn't think it would happen. I'm glad that the Xtracycle people are partnering with larger bike companies; aside from anything else, economy of scale will mean that they will become more affordable.
Keep up the good work! I'm still saving my pennies to get an extension on my current bike. (A Fuji Monterrey. I have a feeling that SOME people will look down their noses at it, but it works for me.)