Set aside a time once a week to get organized, preferable on Sunday, or another time when almost no one can reach you.  That way you will have everything ready for that week.

Also, on top of this, I know this sounds strange.  But, when I'm really excited about going to a conference or something, sometimes (and this has it's pros and cons) I update my CV BEFORE I go to the conference to show that I've been there.  It just depends on the audience I'm trying to reach, because otherwise I'll (a) forget to put it in later and have to dig around the internet to find the official name of the conference and the place and the dates and (b) sometimes regret it later that I didn't put it in when I heard that other people had it on their CV/Resume.  This happened to me once while on a trip that we went to several conferences/presentations, some put it in, others did not - I wished I had added it BEFORE we left for the first destination.  

Keep a calendar (I personally prefer my Palm Pilot).  I'm assuming that everyone has already heard about this one, but since I have a Palm, which is a little different from normal calendars, I'd like to say a little more about that one.  Electronic calendars versus paper, the great thing about my Palm is that you can actually categorize (without buying 14 different color highlighters) your events into Work, School, Personal, XYZ club or activity, AND you can see QUICKLY whether or not you have conflicts.  This doesn't work well if you don't consult your calendar every once in a while, very likely - DAILY.

Set up a system, that's great.  What works for me?  A file system.  Procrastinator, I am.  Professor, I am not yet.  I'm an undergrad (and I know right now you are thinking, yikes) but I have had a lot of experience with moving and never being able to find things.  File systems work for me, and it can work for you.  

Organization, is all about putting some time into it.  Whether you are organizing files for what schools/departments you are applying to or have applied for, it pays to put some time into it.  

I like the "keep everything" approach (did I mention I'm a pack-rat too?).  But, it can get a bit messy and sometimes you have to know when to stop (McDonald's receipts from 5 years ago will not help you get that new job, even if you did itemize deductions from that tax year).