Gzip Compression

I am in the process of switching to a VPS server, and I am previewing everything before I go live on the new nameservers. I know the mod_deflate extension is activated, so I should be able to send everything compressed. However, my pages will not compress! Here is what I have in my .htaccess file:

AddOutputFilterByType DEFLATE text/text text/html text/plain text/xml text/css application/x-javascript application/javascript

However, everytime I check YSlow and PageSpeed it tells me that my page is not compressed. It is bugging the fool out of me. What can I do to get my pages compressed?

Does it have something to do with there not being any .html or whatever on the end of my adresses?