I've just successfully completed a CF Mod on my iriver h120, giving birth to a new h132! I also took the opportunity to install a high capacity battery (2200mAh CameronSino). I used a Topram 32GB compact flash card that, oddly enough, registers in Vista as a Kingston Elite Pro card. I transferred 19 gigs to it in under an hour (faster than I expected). Anyway, I seem to have had success all around.
The only hiccup, actually, is that I haven't been able to update the Wiki with my results. When I go to edit the page it just shows me a blank screen. Well, perhaps I'll be able to take care of that later.
Next step: RTC mod. I'm just waiting on a few parts to arrive in the mail, then I'm busting out the soldering iron

Happy modding, everyone.