Great overview of OOCSS. I've been working towards for some time now. I break my objects out by discipline. Layout, Typography, Forms, etc.
You can see a sample of what I use here: http://github.com/davemerwin/starterkit
If you missed my post on it - here is a little intro to how I used it:
http://andrewdc.posterous.com/behold-the-awesome-power-of-sass-mixins
So far I have been way impressed - and it's great because Compass comes with all of the starterkit type stuff that you always need from the beginning and you just include them as a Mixin (e.g. +blueprint, +960grid, etc).
I don't know if I will every be able to go back...
Really though - you would probably do better starting with a fresh project. Still, it's so useful - it may be worth making the jump midstream.
