Don’t feel like waiting for the next get 16GB flash MP3 players? Then make your own. One of our forum members had put together a nice tutorial on upgrading your 1” hard drive based Creative Zen Micro to a full-on 16GB flash player.
In this particular instance there is not much saving on battery life since the current draw is close to the same, but you may see a few minute improvement. With a compact flash upgrade you may also see an improvement in data durability.
If you are interested in doing this same hack, forum member trikon000 has put together easy to follow tutorial as well as a disassembly guide.