I've got a 4 year old 4GB mini, a 3 year old 30GB video and a 2G iPhone.
It goes in cycles, right now I'm not touching the iPhone's iPod for anything but videos. I figured I had £380 worth of iPods, I was going to keep using them, so the iPhone only gets used if I only have a small bag.
My iPod mini is technically meant to be hooked up to the stereo with my favourite songs on shuffle while I take my video (with all my music) with me everywhere, but it never really works like that.
I tend to play favourites with them, right now my video's enjoying a rare spot in the sun. The mini has sentimental value so it tends to get more love, while the video was the silly £220 impulse buy. Even now I'm itching to find a justification for upgrading the mini's memory to a 16GB flash card, but I don't have anyone to give the video to and I don't want to just dump it in a drawer.