I took a long look at the Clarity a year ago and couldn't make a case for it. The battery was too small to go very far on electricity alone and I figured that I wouldn't save enough on fuel to hassle with plugging it in nearly every day. The gas engine doesn't have much range or great fuel economy.
The Volt has already been shut down.
I like the idea but am inclined to say that those are not the best vehicles to copy.
To get me interested in plugging in a hybrid I would want to see at least a 15kwh battery.
I just recently read an article that claimed that most plug in hybrids never get plugged in because it just isn't worth the hassle to save $1 on fuel.
I am planning to buy a real electric car withing the next 9 months, not one of those.