I am looking to start a service where my customers can login at their homepage, and simply fill out a form with various fields. (description, a few photos from their harddrive, title, etc) I then want this information to be automatically put in a template and displayed on their website, so that they don't have to pay for new designs every other week or have any design knowledge at all. What program/technology should i look into to accomplish this. I know how to program well, so that will not be a problem.

Here is a script that might work.

http://www.xav.com/scripts/genesis/

But if you are start a new service I recommend at you write your own program.