Reading Greg Linden's blog I realized that the technology I developed for medigist five years ago was an excercise in computational advertising.

Here's a project overview:

• Web-crawl a list of URLs and fetch new medical news content [Common Lisp]
• Clean up news using source specific filters and store into database [Common Lisp]
• Automatically tag news according to medical themes using a statistical text classifier [Common Lisp]
• Web subscription interface for medical topics [PHP]
• Manage advertising campaigns and related medical topics and upload PDF ads [PHP]
• Create monthly medical journal (PDF) for each user containing personalized news and ads [Perl, TeX]
• Track click-through rate for news and ads using a trampoline for each embedded article and ad [PHP]
• Do post analysis on click-throughs to improve content and ad selection for each user [Common Lisp]