Oh, I have fond memories of the H320 (it was released right around the time of the click-wheel iPod with the grayscale screen). I could watch movies on my portable music player in colour! My friends' minds were blown.
I still have my H320, though I haven't powered it on in years. I even replaced the battery (with an iPod battery, with the wires swapped on the connector), and I replaced the hard drive with a 30GB model. I also got some accessories for it: a dock for your desk, and also a remote control. It was great for listening to music on airplanes.
I'm planning to try selling it on Ebay now, since I just use my phone now.
That brings back memories! Installing Rockbox, switching the battery… I also found out later that you could get a ATA-to-CF Adapter and basically switch it to an SSD.
The great thing about the Iriver H340 (I had the 40 GB version) was that it could play MP3 and Ogg Vorbis. Also, everyone was running around with iPod with a few GB. I was laughing my ass off. RockBox was a little bit more friendly on the battery. I still use the USB OTG cable which came with my Iriver H340 (I gave the device itself away in 2008).
