Hi Dan,
It's early days for your site I think. I read once that when a new site is added to the search engines it gets quite a bit of attention, but as time goes by things level out and the ranking will drop to a more realistic level for that site.
Do remember that rankings are changing all the time though. Keep faithfully adding content and links in/out and it'll pick up for sure.
Web it up!
Chris
http://www.chrischalkart.com