Just want to chip in with my agreement about leaving so long between updates. As both a reader and writer I can see it from both sides, and if other writers are anything like me then the incredible angst about not updating and letting people down can make you not want to say anything because you just feel even worse about it, instead hoping that you either get some kind of inspiration to finish or that real life gives you an opportunity to continue or even that people might just forget about the story.
I tried twice to say something on my journal about one of my stories not continuing and felt physically sick and chickened out. I even kidded myself that I was going to be able to keep going. And it was so tough when I eventually did get the courage to speak especially since there had been so so long since an update. I did say the story was on hold but even then that was keeping people's hopes up, and I feel so bad about that.
But on the other hand as a reader I DO get frustrated just not knowing what is happening, and just a little note to say "it's not happening right now, sorry" would be more than enough for me...and yet I couldn't even manage that myself so who am I to want that from others!
I think in the end we just have to accept that some stories will be written and posted quickly, some stories will take a long time and others will just stop part way through...and ultimately make our own decisions about how we read a fic, whether we take each chapter as it comes or wait till the thing is finished. I know some peopl eonly read completed works to save themselves the trauma, but hell, they must have nerves of steel!!