Well where to start....
I am the primary author of the Firefox browser plugin mplayerplug-in it is a tool that I wrote because I was sick of having to dig around in the source HTML, download the file and then play it locally. So after 2.5 years later it is a pretty decent tool, not the best thing ever but is solves the problem most of the time.
Version 2.85 is the current release and here is what I am working on now for 3.0
Modular architecture. The enable-* flags are going to be gone from the conf file. I'm making several plugins from the same source so that the emulation of the other plugins can be better. You need mplayerplug-in to do RealMedia but nothing else. You'll just install the mplayerplug-in-rm.so and .xpt files and it will be done
Why am I doing this. Well to make Google Video work with mplayerplug-in this change is necessary, also it makes a few other things a little nicer from a code generation/configuration POV.
Well that is were we are as of today.