PilarHQ, is a product which I've been secretly building for my other projects. I wanted a "light-weight" customer support tool for startups and projects which I hack on. Zendesk is kinda complicated, as it requires some training. I wanted something really really simple - like posterous.
It works simply: You cc/forward any support you'd like to be published on your help page to post@pilarhq.com and we update your support page. If people come to your support/help page, search for an answer via our instant search and dont find an answer, they just have to leave their email and your entire support team is notified.
PilarHQ is lightweight because all you do is pretty much embed an iFrame to your site at pilar and you're set. Thats really all there is to it. You later on recieve emails from us and your customers, if you forward the ones you want to publish, we publish it to your cool support page.