iPod Touch Gen 1 - as digital audio recorder

Every now and then I need a digital audio recorder (I may need to lav more people than I have wireless units, or I'm putting a POV camera without audio inputs into a vehicle). I have an H4, but it is large, and when I travel light, it usually stays home.

So I'd like to know whether I can use something I do tend to take with me: an iPod Touch 32gb, 1st gen. Apple sells a combination earphones/mic that plugs into the earphone jack, but it only works on 2nd generation or later iPod Touch. And it doesn't look like a very serious mic anyway.

For the iPod Touch Gen. 1, there are several after-market thingamajobs which use the power port for a mic input. Some even seem to have plugs for external mics. Has anyone here used any of these? Is the voice audio quality at all reasonable for broadcast video?

Thanks!

Bob C