Great post on www.John-Carlton.com about writer's block.
He's running a quiz (with prizes) but both me and you are too late for the prizes.
But the suggestions about what writer's block is are interesting.
For me writer's block is an excuse not to get on and write. Saying you can't write might make me seem interesting but there are enough different ways of writing and approaching how you write to spark off something.
What you do with the writing afterwards is a different matter.