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.
Good points, it definitely took a lot of effort to switch into web development.
There is a lot of good information here in HN for web/cloud stuff, that's how I started in web development (and doing all courses/projects I could get my hands on)
After that, I started doing freelance work on Elance, for next to nothing initially but it picked up really fast.
For cloud/web development there are a lot of meetups depending on where you are as well.
If you have some questions about the web side of it you can contact me on the email in the HN profile...