Maybe it's because I used to write manuals for a living – you cannot conceive how long ago that was – but I do like a good manual. This is a good one: if you are havering over buying the new OmniFocus 2 for Mac, take a look at the free manual.

OmniFocus is the personal task management tool that helps you keep track of all the goals, plans, errands, and aspirations that come up in your life. Whether the task at hand is something small, such as setting a reminder to swing by the bike shop after work, or the tasks are part of a bigger goal, such as making plans for that long overdue vacation, OmniFocus helps you keep track of everything you need to do throughout your day.

Available on your Mac, iPad, and iPhone, OmniFocus is packed full of tools to help you prioritize steps within complex projects or simply jot a quick to-do list for a weekly meeting. OmniFocus works great as a standalone productivity aid or in conjunction with whatever time- and task-management scheme suits your personal style.

Excerpt From: The Omni Group. OmniFocus 2 for Mac User Manual

By the way, that last sentence is a coded reference to GTD, Getting Things Done (UK editions, US editions). OmniFocus works superbly with GTD but has no official connection with that system by David Allen.

More importantly, this smartly, clearly written manual is on iBooks and joins a growing set of free books from the Omni Group.