Testing tracking user registration events, how they registered (Standard, Facebook, Google+, Twitter, etc.)... and also doing some trickery to keep the user's original source/medium intact. Normally when someone registers with their Facebook account, it shows the user was acquired via facebook.com referral, but that's not actually the case since the "referral" Google Analytics sees is them authorizing usage of their Facebook account during the registration process. So we are handling those cases now (same with redirects to paypal.com to buy user upgrades... paypal.com didn't refer them, even though Analytics show it as such normally).
So like this is how it's showing registration events on my site now (before all the Facebook registrations were facebook.com referrals):
Speaking of event tracking, I decided to just go crazy with it... lol It's using event tracking for all sorts of things now if you want (moderator actions, new content being created, reports, people clicking *outbound* links, etc.)

You can drill down on any event category to get detail...
For example if you drill down to Links -> Clicks, you can see what are the most popular links being clicked on.
You can break down events by anything in Google Analytics, for example you could see the geographic area where user's that are being reported are at:
