CyanogenMod has really taken off in my opinion after Android 4.0 (Ice Cream Sandwich) was released. Since last November, CM9 has been built for dozens of more devices than any other CM ROM. Of course it helps that almost the entire hacking community has helped back the project. CyanogenMod is my personal favorite just because it is based off of stock 4.0 with little improvements which I believe should have been included in the stock OS.
With all this progression, CyanogenMod has even got a new mascot and his name is Cid. It gives the company a new look that was needed badly. The video of the brand new boot animation can be seen below!