Don't have time to blog this right now (off to protistology conference today -- will bring back lots of goodies!), but there's a new review paper about CNE out a couple weeks ago. It's paywalled at some rather obscure journal that an institution as big as UBC doesn't have access to, so here's a pdf y'all can [hopefully] access!
Lukes et al. 2011 IUBMB Life: How a Neutral Evolutionary Ratchet Can Build Cellular Complexity
See, if this was published in a proper (ie, open access) journal, I wouldn't have to do this. As taxpayers you all have the right to see this, outdated publishers be damned.