Lijit is changing the way how your readers search your blog, With Lijit readers can search your blog networks, bookmarks, photos, blogroll, and more. It also gives the blogger detail statistics on your readers, where they came from, Popular search, Popular post and more.
Lijit also helps bloggers monetize their content via Search Results, Banners and more.

AdSense is an advertisement application run by Google. Website owners can enroll in this program to enable text, image, and more recently, video advertisements on their websites. These advertisements are administered by Google and generate revenue on either a per-click or per-impression basis. Google is also currently beta-testing a cost-per-action based service.
Google uses its Internet search technology to serve advertisements based on website content, the user’s geographical location, and other factors. Those wanting to advertise with Google’s targeted advertisement system may enroll through AdWords. AdSense has become a popular …

Google Ad Manager is a product within Google’s AdSense network based on a new hosted advertisement management tool.
Google Ad Manager has been seen as a direct threat to OpenX, an on-premise software solution (known previously as OpenAds and phpAdsNew) for managing the advertising campaigns on websites. Both solutions serve and track the performance of ad units sold either directly or introduced by third party networks like Federated Media or Google AdSense. But only Google can “use AdSense to fill unsold inventory or compete on price against other ad networks,” optimizing …