Good for you guys! I regularly commute and think it would be a blast on the tandem, but Pam's office is on the complete other side of town from mine. As a novelty, we tandem commuted during Bike to Work Week, but I had a single bike staged near her office for my ride across town. We pretty much had a blast that week, but felt like it got us home too late to be doing it on a regular basis. Not to mention the fact that we kept stopping for dinner!
The sad thing is that she used to work just a couple of blocks from me and we never took advantage of the opportunity when it was available to us.