I know exactly what you mean about just wanting to get out running. I would have settled for doing the club 10k handicaps but bailed yet again last night after failing to do an 8k trial run two days earlier.
The cycling is a really good release though and I go with the local tri club on Saturday mornings (which is around 50 miles) Although I'm not up there with the group 1 riders, I do feel that I've been making good progress and the hip and ITB are fine.
Swimming is also progressing well but it's pretty boring to be honest.
There is no substitite for the running in my opinion but cycling is coming close and is keeping me in shape so if (and its a big if) I get my injuries sorted then I should have a good base to move on from.