H3Modded iriver firmware, inSkins, and Rockbox.
I'll probably upgrade the battery eventually.
Hard drive... well, I have a plan. Freepay (the only legit "free stuff" site I know of) operates three iPod sites: one for Nanos, one for 30 GB iPods (and, strangely, Nanos...), and one for 60 GB iPods. Their rules allow you to complete each offer only once, but each site is considered separate. As such, I plan to do one of each... the Nano shall be Rockboxified so I can have a flash player; the 30 GB iPod shall be butchered for its HDD (giving me a 30 GB H320 and a 20 GB iPod, which I'll probably sell); the 60 GB iPod shall be kept for video (because for that purpose in particular, it beats the pants off my H320). Though, perhaps I'll sell both and buy an iAudio A2 (or whatever's looking good by then). (Skeptics, feel free to comment; I care not

)
Internal USBOTG mod will probably be done when the warranty expires in May.