QUOTE(jo.clarinet @ Sep 10 2005, 01:43 PM)
Within reason, it should be what feels most comfortable to you. It's a good idea to experiment with slightly different angles to get the best possible sound.
I'm OK with the angle of mine, but I have to fight against a constant compulsion to lean it a little to the right - probably because I've been playing tenor and bass recorders like that for so many years (to make the reach more comfortable for my right hand) that it has become second nature! I don't actually think that it affects the sound at all, but I've been told I should try to keep it straight.
From what I've been told, it's not so much about the effect on the sound as the effect on your dexterity.