You can share your Adsense account with many users. This function from Google is still under beta version. This feature is just like Google’s other product, as in Google analytics you can add multiple users to share your website statistic, manage things there etc. Same as that you can add
Adsense Archive
Are you Google Adsense publishers or advertiser? Then in case of advertisers they should check how compitators ads looking and how to create attractive and keyword targeted ads. In case of publishers they should check what kind of advertisement is displaying on their website and is it ad serving available