blank line introduced on server side!?

I am using Wordpress 2.0.6 on Fedora Core 5. An RSS feed is not working for 
http://survivalofthesickestthebook.com/blog/?feed=rss2

When I use feed validator
http://feedvalidator.org/check.cgi?url=http%3A%2F%2Fsurvivalofthesickestthebook.com%2Fblog%2F%3Ffeed%3Drss2

I see a blank space on line one which renders the page unviewable. none of 
my files have a space at the top, and I have no idea why the page is being 
served with a space at the top.

what on the server side would introduce a blank space on line one before the 
xml statement?

thank you!