After the public beta begins, we should promote this site to increase our number of experts and get some more traffic. A good starting point would be to promote the site to skeptical bloggers and on message boards targeted to skeptics.
Skeptic bloggers have already an audience that they could direct our way if they would blog about us. They might even join our community and answer some questions, if we're lucky. When we contact them, it would be good if we find people that already had some interaction with the blogger in question, as a request from someone they know carries more weight than if someone they never heard of asked them to promote some website they never heard of.
Posting on message boards about our site is also a good way to promote it. It also would be nice if established members of the boards in question would do that, if brand new users promote some website in their first post it looks somewhat like spamming. Even better would be to use an appropriate answer from this site to answer a question on the message board. This would showcase our content and might lead some people our way. But don't just drop a link, the content here is CC-licensed, just copy the relevant part of an answer with the correct attribution, this will make a better impression.
These are just some ideas to promote our site, let's come up with some more.