Well, my wife and I finally bit the bullet and bought new bikes (trikes actually). We had been in the market for a tandem and then decided to go with a bent tandem. Well, we went to the Hostel Shoppe to test ride an XXL Screamer (we are in the Chicago area so it wasn't a huge trip for us). We took it out and it definitely fit me better than the standard frame. When we came back my wife saw the Greenspeed tandem on the floor. It was already fit for a customer so we couldn't test ride it, but we did sit in it. She was hooked. After talking with the sales people a while they also mentioned that two Hase Kettwiesel trikes can be combined to from a tandem. They happened to have an XL on the floor so we took those out for a ride. 30 minutes later my wife was saying, "We'll take two. Can you have them ready for Saturday?"
This provides us the flexibility to take them out individually when around town, but for longer treks, we can hitch them together and our riding differences won't be as much of an issue.
We took them out yesterday for their inagural run at home. Talk about FUN! It'll take a while to get my wife's endurance up to par (she was done after a few miles), but we can always hook them together if we need to.
And now we have a whole new gift category (computers, clothes, lights, ......)