Matt, Metafilter's founder, gave a talk on community moderation at this year's SXSWi http://lanyrd.com/2011/sxsw/scrdr/ . To sum it up: good moderation = moderators and powerful troubleshooting/profiling/stats tools.
Unfortunately I haven't found much about community growth and innovation, but I've just started my research. I've been thinking about setting up a blog/wiki on this topic. Anyone interested in this?