Sherflock (we love the name) is a tool to find more people to follow based on the WeFollow hastags. Filters in the tool then help weed out spammers. Login was not oAuth, they blamed Twitter for not having oAuth up at the time.
Well it seems this is only a free service during beta and will automatically start following @sherflock when you register. They have a plan page for payment after you register. I tried to view the plans but it wouldn’t even let me do that without registering. So more on this tool may have to wait until they give us some screenshots or info without all the hoopla.