How to cut a crumbly baked item (e.g. cereal bar) without it disintegrating? When baking something which needs to bind - like a (British) flapjack / cereal bar - I have mixed results when it comes to cutting it, even if I repeat the same recipe. Sometimes it binds really well, sometimes it's a crumbly mess, especially after cutting.

Apart from the obvious: a) pressing down hard and evenly before putting it in the oven and b) using enough binding agent (honey / syrup / fat), what other tricks are there? 

e.g. Is it better to cut hot, warm or cold? Leaving it to go cold in its tray seems to work best, but my instinct and habit with all baking is try and get the item out of its tin/tray immediately and let it cool on a rack.
I suggest that you try to go against your habit! :) Cereal bars and the like don't really need to cool on a rack: just put the baking tray in your fridge when you're done baking the bars. That way they'll set much better, as the heated (and thus very soft) sugary components can cool down and firm up. You will find that it's much easier to cut the bars once they've been in the fridge for a while.
It also helps a lot to use a sharp and wet knife when cutting. That way you will slide through the bars more easily and the bars won't stick to the blade of the knife.