I just had a pretty cool idea to motivate some people to recruit mostly, and maybe able to be expanded to new stuff later.
What about having under each person's name a little row of small icons, or Member Awards. They would be things able to be earned, and would contribute to the community when earned. For example if a person has more than 10 referals (members they've gotten to join through spreading the word) for example, they'd get a little "R" icon/award for recruiting. I thought about having an award for post count, but that wouldn't be a good idea. Maybe after you submit a DIY that's admitted to the knowledge base, you get an award icon for that. That way you can look under a person's name, and the more icons they have, the more they've contributed to the community. Know what I mean?