Not only can chat bots push ads, they can also intelligently deliver content on demand, and the bot for MAKE magazine is the first on the field:
"The MAKEbot is a AIM/iChat buddy you add to your buddy list. When you type latest, he will give you the latest news from Makezine.com. You can type "subscribe 1" and he'll deliver the latest news each hour. If you type "photos" you'll get the latest photos from the MAKE photo pool, type "bookmarks" you'll get our latest bookmarks, type "Instructables" you'll get the latest how-to projects. Lastly - if you type keywords like psp, welding, ipod or whatever he'll search the MAKE site, the pages from MAKE and give you a link from our search engine to help you find what you're looking for."