I'm a pretty extreme technophile so I have everything you listed
(even have Facebook, Myspace, and Twitter
).
I think what we're seeing now though, and will continue to see more and more of, is convergence of all these devices. I carry an iPod Touch with me for example. It's literally always with me - I use it a lot for music and podcasts (like you I've gotten REALLY into podcasts), but with the apps that it contains it totally replaced the Palm Pilot I used to carry. If I need to jot down a quick note or do simple little tasks then the device makes for a very good PDA. It also has enough little casual games to use as pass-times that I don't carry a Gameboy or anything either.
What's interesting though, is that with the WIFI of the unit, I have found that a lot of times I can make do with the iPod in places where previously I would have needed my laptop (which I often don't carry). Need to log into Yahoo and find a list of nearby Indian restaurants? The iPod works fine - so long as I'm near a wifi hotspot.
Most of these types of devices have been merged with phones for a long time - I still haven't bought one yet, but I'm seriously looking at the Droid Eris. Being on the celular network for data also alleviates the need to always to on the hunt for a hotspot. Interestingly enough most of those also are coming with decent cameras now too. Most of the new smartphones are sporting cameras in the 5MP range. Now I've got an INCREDIBLY nice Canon Digital Rebel XT for when I want to takes some good pictures, but the thing with that is that it's bulky, and like with a lot of my other devices, I just don't have it with me when I want to use it. These newer cell phone cameras are getting good enough now that they can actually take a halfway-decent picture in a pinch.
Getting a good phone that also works well as a PDA, laptop replacement, makeshift camera, etc is top of my list.
