I use a tiny clip, pinched off a headset from work, its just like a peg and clips onto the wire and then onto your clothes. That way I have exactly the length I require.
However I now run without an ipod, mainly due to the fact that headphones kept getting wrecked in the rain and disrupting my rhythm. I now just count in my head, admittedly not as good as listening to music but a good way to keep focused.
Seems like the wind might be a bit of a bugger, the last thing you want in those final miles is a headwind, hopefully its non-existant, however based on the wind here (in miserable Wilts) I would say that its going to be blowing a gale in Scotland, on the sea front!