I'm a bit new to this writing malarky. Oh, I've written lots of opening chapters, character sketches, short stories, and the like, but until I came on here, I never had the impetus to really get stuck in and just write.
I'm finding that I'm just enjoying the whole process immensely, now that I've got beyond the opening chapter doldrums.
But I'm also finding something a bit peculiar going on, and wondered if other writers get the same kind of sensation.
I have a beginning and some idea of where I want to get to - but the in between bits could go in several different directions. I find myself really looking forward to what's going to happen, and what the characters do next - it's almost as if I'm reading the damn thing, not writing it. I start to write and things happen, and my characters and events surprise me.
Am I just odd?
Simon 
Totally agree. Nothing beats it, and that's why so many of us are at it.