Is there a site/service that allows to easily build and maintain an online comparison grid of items like products, software, etc. according to various characteristics and let visitors compare those that are important to them and sort them accordingly?
If more than one people can collaborate on it or if it can be free for all (wiki style), even better!
I was considering Google Spreadsheets but it doesn't let people hide the columns they aren't interested about and focus on what they want.
