This may be a duh tip for most, but as a new WordPress user, I have only just found out how to send posts to my blog by email, which is really handy for a quick random thought.

You can choose to post immediately, later or leave as private until you decide to post it, and you can also do things like adding categories and tags as you email. Simple but brilliant.

http://en.support.wordpress.com/post-by-email/