- A month or so before I plan on taking off, I add a little note to my email signature informing people that I will be unavailable on those days.
- The day that I am leaving, I set up an email-auto-responder so that anyone that emails me knows that I am unavailable and when I will return.
- On my website, I activate a notification module (block) that appears at the top of every page, saying that the office is closed and when it will reopen.
If I am going for an extended leave, I would also probably change my voicemail-prompts and send out an email in advance so that my clients can plan accordingly.