As I write this, Twitter is dead. Not just down with the usual overusage whale or twittery bird, but completely dead as in their home page won't even come up.
This begs the question of how useful the service really is when it seems to spend so much time being down instead of up. Over on Men with Pens, there's a lengthy discussion going on about just that subject.
I've been using Twitter since my initial post about how I didn't get it. I like it well enough now. I don't use it all the time or even every day, but it was recently #2 on my list of driving traffic to my site (it only recently fell to #3 behind StumbleUpon), so in that respect it's been a boon. I also like the quick interaction it provides with others. However, when it's down, it's down, and not of much use to anyone.
One solution for when Twitter is down and you still want to twit is Twiddict. Think of Twiddict as an offline version of Twitter. Ahhh, maybe that's not the best way to describe it, but Twiddict queues your twits for you until the Twitter service comes back up. Then, when Twitter decides to come back up, it shoots them over. I've just tried using the service, so I can't attest to it's reliability, but it's a good idea and certainly interesting how niche apps crop up to fill gaps created by other applications or services.