GlimmerBlocker is a web proxy which blocks ads.
It’s easy to set up.
It works on all of your browsers. Even for your iPad or iPhone/iPod touch.
You can easily make your own filters too. (Yes, even you.) It’s easy.
For example, I made my own filter which blocks that stupid anti-Missing-E nonsense.
If you were running Glimmer Blocker, you could add http://f.luo.ma/xml/tumblr-missing-e.xml to your list of filters and it blocked forever.