There are various things in my nearly mature plugin, Activity History, that I've been hesitating to do because I either can't decide how to implement it or aren't good enough to do it alone. Such features are listener-based data collection, some of the data analysis commands, and UUID support. I'd like someone to work with me on these features. If you're interested, you can look at my GitHub repository (link on the dev bukkit page linked above). We can discuss roles and point distribution in PM.