yeah, my car player is actually an mp3 cd player that has an aux input in the front, i got it a few years before i even heard of an ipod(i was deciding between this and a minidisc car player at the time

). Then i got an ipod a few years back and the aux input hole was great. I was so used to using mp3 disks that I didn't even want an ipod, i got it as a gift, but it soon took over and now there's only 2 mp3 disks in my car in the glovebox and only use them if the ipod/rokr dies.
even with the ROKR's 100 song limit, at an average of 2min/song, i'd have to be on a 3+hour car ride to need to switch out if i were using cd's instead. So even as a diehard mp3cd fan for many years, I still consider this an upgrade to having to burn/keep track of/switching cd's to play in the car, plus I can take it with me and keep listening elsewhere.
not to say i'm blind to the downsides. even 4 or 5 hours of music would not have satisfied me at my last job where I listened to my 40 gig ipod 95% of the time on speakers or headphones while working 9+hr/day. And I completely agree that the 100 song limit is lame. (i looked for the hidden folder that james guy mentioned and it's just not there. there was a settings file, but deleting that did nothing)
anyhow, i'm just rambling. the rokr filled a nice niche in my digital life, and i know it's far from perfect and flat out wrong for some people, just letting you know where i'm coming from. I still have my 1gb free ipodshuffle that I can load up for my longer trips. I'm with "Steve Jobs" on SNL, bring on the ipodphonecamera micro, the one that's invisibly small and holds 1 billion songs
My ideal iThingy: slightly larger than the rokr(give me durable, not tiny), full ipod video OS(with contacts, games, no song limit, etc), phone, video, 4+MP camera with a nifty zoom lense that slides in keeping the thing slim in your pocket, and of course bigger and bigger storage limits. I don't think I'd be the only one willing to pay $500+ for such a device.