Usability testing tool - possibilities...

UsabilityInfomaki: An Open Source, Lightweight Usability Testing Tool describes a tool developed by New York Public Library to spread the usability testing load among visitors to their website - visitors are asked if they want to answer a single question; if not, they're not bothered again; if they do answer it they're given the option to answer another one. Because it's not asking much of an investment in time a lot of people will do it, and then because it's so easy a lot will answer more than one: "In just over seven months of use, it has fielded over 100,000 responses from over 10,000 respondents."