I am in somewhat of the same boat, being an embedded developer wanting to get into cloud computing / web development.
I've had lots of callbacks and a few interviews, but no big breaks so far. It's been pretty tough on my ego.
My only advice is to stick with it, as when you do find a place that's willing to look for someone with interests and drive rather than if they're used the latest toolkit, you'll probably find that they have other positive qualities as well. At least, that's what I've been telling myself.