With a link, we could look at the feed too… *hint* 😉
Has the feed ever worked?
Any recent plugins installed? If you disable plugins, does the feed then work properly?
At first glance, it seems like you may have a plugin with some extra whitespace (spaces, line feeds) before the opening php tag or after the closing tag.
feed was fine yesterday, tried deactivating plugins but problem still ongoing
ANY changes between yesterday and today? Theme tweaks? Plugin installs? Server upgrades?
no.. nothing, what i find strange is technorati has picked up todays post even with the feed error
how would i edit out the spaces
I would use FTP and copy the files under plugins to your local machine. Then, use a text editor (notepad works, not MS Word!) and open each plugin file. Look for spaces/lines before the top <?php or after the bottom-most ?>. If you spot any, delete them, save the plugin and upload it back up to the server.