Twitterless

I got an e-mail update from Twitter this morning, which I signed up for at some random point.  I don’t understand Twitter.
I have tried to limit the social networking sites I’m on and focus on ones that could potential be career-related–Facebook, LinkedIn.  I hear GoodReads is fun but I just can’t imagine myself having time to upload all the books I own. 
I gave up on Myspace forever ago, and linger around on Friendster just to see what old friends are up to.  Honestly, I mostly like it b/c people generally leave one another alone there.
So, what gives with Twitter?  I don’t get it, and I’m hoping a more ‘net savvy blogger like Leah can fill me in on the attraction.  As far as I can tell, it updates people on what I am doing.  Which would not be terribly interesting.  Hey! I am working!  Hey! I am still working!  Hey! I am taking a nap! Hey! I just went for a walk!  Guh? 
Am I missing the point entirely?
(and this entry confirms that my life is not terribly interesting–since the concert Saturday night, I managed to nap a lot, bake chocolate chip cookies, and run errands.)
ETA:  On a related note, I am on the cusp of Gen X and Gen Y according to this quiz.  I say I should bump my score a little since I use acronyms like “ETA” and I don’t mean expected time of arrival…