writer's block

How does one break a writing block? I've tried lots of things: reading; watching the birds; sitting outside; watching movies; cleaning; gardening. I have some cool pictures of birds feasting on my flowers and weed-free flowerbeds (for the moment, anyway), but not much output on the story I'm struggling with. I'm able to eek out only small, 3 to 5 line paragraphs at a time. At this rate, it'll be 2012 before it's finished. Sad.