I've been asked to modernize some technical documentation - user manuals in particular. I have some guidelines, but a lot of free rein to take it in whatever direction I think is worthwhile. Where can I look to learn what exactly is a good example of "modern" technical documentation? I'm interested in resources such as websites that describe best practices as well as resources for learning state-of-the-art tools.
I am interested in tools and specifically information on layout and organization.