please help! spam flood

hi there,

please help me. i have set up a site using wordpress

http://freethought.co.za/blog/wordpress/

i enjoyed using it and found it very effective. BUT, spammers have found my site and when i open up the “comments” page, i get drowned with spam for gambling and porn.

how does it get in? how can i block it? i can’t click the spam button hundreds of times a week. how do other bloggers cope?