I didn't know about rails asset management (I'm more of a django guy), thanks I'll look into it.

I really like your description of it as a package manager. In those terms I'm starting to think more like an app store for your web site.

My thinking was more around a company setting where you've got change control processes in place and deployments perhaps aren't as easy to orchestrate/are too much effort.

Then there's my personal itch which is that for every product I build I seem to be doing the same things over and over again with Olark, Woopra, Google Analytics etc.