I'm beta-testing Litmos - a SaaS training delivery platform that you can use to create, deliver and manage online training courses, communicate with trainees and track their progress. Cost is $49/month and then $3 per active user.
You can upload a PPT and then track who viewed the PPT. Upload any type of content, including PDFs, Flash files and create assessments. The Litmos platform automatically notifies you when training is complete or overdue by sending alert messages. Reports allow you to track individual trainee progress & results.
Check it out: http://www.litmos.com/
