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Uservoice has Single Sign-On http://uservoice.com/faq#sso Unfortunately it's only available on the more expensive plans.

fwiw we (uservoice) also allow anonymous feedback and have a 50% off coupon for any startup.

50% discount if a startup asks?

There's a coupon code in the sidebar here: http://uservoice.com/for/startup

neat. thanks for doing that.