Help Please With Trackback Spam On WordPress Blog

I’m wasting about an hour a day deleting Trackback Spam which is really annoying.  What’s the best way of stopping it?  I’ve tried installing the Trackback validator, which has helped a bit but hasn’t stopped all the spam.

Also, how do I get the latest trackbacks to display on the Dashboard?  At the moment I’m having to delete them by following the ‘delete’ link on the email notification.

Thanks.