Hi,
You might want to read here for a quick explanation on how CPM rates are calculated. Hence you may note that your CPM rate will vary dramatically, depending on what campaigns you get and which ads are suitable for your blog.
Argh, can't post links. Go to Advertlets.com, click Help, click KnowledgeBase, then Bloggers , then Earnings.
We've got some new campaigns already confirmed. Just gotta prepare the creatives for it

Cheers.