We went to Barcelona in the weekend, so I didn't go for any formal runs, but we did do a lot of walking around.  It's not quite the same, but good to spend some time on my feet.

Whenever I can (e.g.: standing in meetings, waiting for the DLR), I have been doing squats to exercise my quads.  I am noticing some change, but I think it will need a month or so before the change is significant.

I am concerned that I haven't been on many long distance runs as part of this marathon training.  There is only two months to go and I would want to run at least 3 times greater than 180 minutes.