That kinda ticks me off as well, why am I going to spend 99 cents a song for music I can't take with me if I switch devices? I didn't know about this when I had the iTouch, and luckily I purchased my music on mp3shake for a quarter of the price (well for a quarter actually) and I have that option.
They either need to lower prices or be more flexible.
I come in last, but just in time for breakfast.
Keep it through, Keep it through, forever blue.