We don't have any, but there's been a lot in the news about them and how they will solve all cycling problems.
Personally, the only way I would ride in Boston is if there were other traffic calming measures, like decreased speed and maybe some painted bike lanes. Heck, I won't even drive in the city. I see so much egregious driving in the 2 smaller cities I work in, and on the freeway, I cannot wait to get a job in my calmer area.
I think that cycle tracks would give a false sense of security to "regular" cyclists. I once rode on a bike path that went in the opposite direction of traffic, in Quebec. It just felt wrong, and getting onto the right side of the street when the path ended was awkward.
For starters, I'd like drivers here to use turn signals and learn how to change lanes. And maybe not drive 80+ miles an hour whenever it seems right.