Increase Search Engine Traffic by Using Compete
This site called Compete is pretty interesting to snoop on a website's popular search terms.
When you register, they'll give you 5 free credits to poke thru various websites and show you their first couple of most popular search terms free.
Here's a graph of a few sites I typed in:
Then, I used my credits to find out some popular keywords for one of the sites like: bossip, amy winehouse, bossip.com, tracey edmonds, lauren london, hip hop gossip, etc.
Pretty interesting tool.
Find a popular topic and build a post around it -- it may bring your related site traffic, too.