Today I ve installed my blog here on a godaddy Hosting-Account and when I tried to set up the permlink structure of the wordpress Blog changes within the .htaccess file didnt affect anything. I tried 1 hour different combinations and nothing seemed to happen.
Finally I found some advices that I just have to wait a few minutes after a change and then it should work. And voila: it worked. So that means changes to the .htaccess document are not processed immediatley, but after a while (maybe 5 to 10 minutes).