I'd tell you about Creative Weblogging's new ad network called TierOne ads. This network allows bloggers to register for free and set their own CPM rates. Advertisers are then able to chose the ones that best fit both their target audience and their budget. It's fun, it's free and it is an exciting opportunity for both bloggers and advertisers. If your business is blogging or you're looking for a high quality ad network to promote your product or service on, check them out!