Commenting on Lifehacker offers a great way for readers to share tips and chat, but for rich, full-on how-to guides and the like, Productive Geek provides a solid forum.
Launched by our very own How-To Geek, the aptly named Productive Geek has rich forums complete with advanced formatting, code-friendly pasting and all the image uploading you can handle. In fact, we've officially moved the Lifehacker Coders group to Productive Geek to continue their AutoHotkey scripting madness. It's also got forums dedicated to Windows, Linux, OS X, media centres, desktops, Google, GTD and more.
It's a young forum, but it's got a lot of promise — and we're always big fans of what the How-To Geek has to offer. (I also just added a question of my own to the Media Centre forum, hoping to soon update my XBMC guide from last fall, so I'm selfishly aiming for some answers, too!)