If you don't have one, right now, set a reminder.
I'll assume most of you use Outlook, but in whatever calendar program you have, be it Google, a cell phone, whatever, create a new reminder now. Here's what you put in it.
Title: Touch your resume
Recurrence: every 90 days
Details: Check resume
- update Linked In/Facebook/Plaxo/wherever your profile is.
That's it, and then save it. When it goes off in 90 days, do the same thing you'll do today.
Check your resume, see if you have done something significant since the most recent thing you have listed on it. A new job, a new position, new responsibility, a new project completed, anything. If you have, add it. Then look for something to remove if you're approaching the 2 page limit.
If you haven't added anything, you should have just spent about 90 seconds thinking about things.
Next go to your online profile(s) and give it a quick look to see if it matches your resume. Make sure it does, and then get back to work. You've only spent a few minutes on your career, but you're prepared in case something happens.