The Ubuntu Manual project make a very comprehensive beginners guide to Ubuntu for every release. The most recent guide, titled "Getting Started with Ubuntu 12.04" was released yesterday and is packed full of everything you need from getting online, to sending emails to navigating around Unity.
The Ubuntu Manual Project founded at the start of 2010 aims to provide a feature-complete reference guide for new Ubuntu users, available in PDF format for free. Already successfully releasing versions for Ubuntu 10.04 and 10.10 in English and three other languages, the team has now set their sights on tackling the new Unity interface and completing the almost 200-page long book for Ubuntu 11.10 Oneiric Ocelot.
Over a year ago I founded the Ubuntu Manual Project, an open source Ubuntu project aimed at creating a comprehensive beginner's manual for each Ubuntu release. I led the team for around 10 months, before I had to step down as Team Lead due to other commitments (namely University, and also Ohso - the company that runs OMG! Ubuntu! etc). The team went through a bit of a lull, with a lack of contributors, no leader and little motivation to continue this awesome project - which was a complete shame. Luckily though, they've re-grouped and are now working on building a new website (which I designed way back in June last year), as well as head-hunting for two suitable people to act as Project Leader and Editor-in-Chief.