Opquast goes international
Opquast is a popular online tool for quality assessment of web sites. Until recently it was only available in French, but the team behind it (Temesis, headed by Elie Sloïm) has localized ;-) it in English, including its useful online evaluation tool: My-Opquast which allows you to benchmark a site against 153 best practices that were elaborated with the community (more info over here).
Disclaimer: I know Elie personally and I briefly participated in the community effort during the launch phase. This said, if you're serious about quality testing, you should give Opquast a try, it's free for up to three sites and cheap for the benefits it brings to larger design projects.