Is it possible to make a "page, not a blog post" the main entry on your site?
I'd like to be able to create a summary of the latest content as the first page the user visits on my site.
I'm using Wordpress 3.0.3
yes, it's a simple setup in your wordpress settings,
so, go to your Admin area => Settings => Reading and select to use a Static Page as a Front Page, from the drop down menu select the page you want to use and put inside the content you want/need, just don't put a Loop inside.
You can also do it with a template file called "home.php" But I also prefer the method with the wordpress settings. It really depends on if the page looks different to a normal page.