And not to get too far off it, but does anyone have a set of tools for remote pairing that they really like?
Even if pairing isn't something you're doing constantly, I do think that for many teams and jobs, it's useful _sometimes_. But when the norm was for everyone to be in office, it was easy to start and have a solid high-bandwidth session -- just both pull up to the same desk. I find voice + screenshare still misses a bunch of cues, lag is of course disruptive, and the switch between who has control of the screen etc is clunky, so one person tends to drive for a long time.
My employer, VMware, has many teams working on Cloud Foundry that do pair programming. It can be more exhausting to pair program remotely, so I would reckon few do so 40 hours a week.