Anybody experienced anything like this?

I decided to finally get around to purchasing the Duckworth Lewis Method the other night, on the strength of really, really liking There Goes the Knighthood. I did this by the still rather exciting method of buying it via itunes on my ipod touch, and all came down the invisible wires seemlessly.

Next day I plugged into my pc to synchronise the ipod and, as expected, got the bonus booklet (never really seen the point of having these booklets as pdf other than to make you wish you'd bought the actual cd, but never mind). What was not expected was that, following synchronise, all but 4 of the album tracks had disappeared, and were nowhere to be found on either ipod or pc.

I'd only got as far as 'The Sweet Spot' at this point, and there it was, gone - just the first 2 and last 2 tracks remained.

So I've mailed Apple but so far received no response. From what I read, they're quite likely to smugly ask if I made a backup. But who backs up before each synchronisation? Me, from now on I suppose.

Anyone had similar trouble?