The UI is not intuitive. You need some messages that help the user navigate and use the site effectively. Right now I m just clicking around trying to make sense of it. (you could include messages with a "Dont show this again" option)
what part is not intuitive? the search engine? the blog part? the integration of the two?
Maybe include some information on the front page describing how the service works. If you want to go all out link to a video demonstration of it working or a quick walk through.