Why can't it all just be messages?

My mobile device is driving me crazy.

I have an iPhone 4.0. Normally when it's driving me crazy, it's standard stuff like the battery life sucks or that the iOS 4.0.1 update didn't fix the proximity detection or stop emails I send via Exchange from just disappearing into the ether.

This time, it's something else and I can't blame the iPhone; I think all modern smart phones have the same problem. The problem is that I constantly have to switch between apps to see my messages. Here are screenshots for 5 of the messaging clients I use reguarly:

This list doesn't include real-time messages like IM, or notifications like Twitter or RSS. I'm just talking about plain ol' async messaging. We used to think of it as "email," but really voicemail, email, SMS, MMS, Facebook messages and Twitter Direct Messages are all the same -- they are meant to queue up until you get to them.

Now, some folks would argue that SMS/MMS aren't meant to be queued; they're meant to be seen and handled immediately. Personally, I find it annoying that there is a pop-up for every single text or media messages I get on my phone and there seems to be no way to turn that off. On the other hand, if I want that to happen for other types of messages, e.g. voicemail, I can find no way to turn it on even if I want to. Why are text messages special, especially since most mobile clients let you get over the 160 character limit and will just send them one after the other for you anyway?

iOS 4 takes a step in the right direction with the "universal" inbox:

Here I've got a great UI for getting to all my email messages at once, but why can't it handle all my messages instead?

Not only would this put all my messages in one place at one time, but it would unify up the UI and preferences across the various messaging sources. Do you want your text messages to quietly queue up like email? Done. Do you want your voicemail to pop to the front like an SMS? Done. Do you want the same swipe-to-delete gestures on your voicemail as you have with your email? Done!

Maybe someone with some experience on the new Windows Phone 7 can tell me that there is a "messaging" hub that manages all this for me. Since they're already doing things like bringing facebook pictures into the "pictures" hub (or whatever they call it), that doesn't seem completely out of the realm of possibility. If that's the case, I'll say again what I've been saying for a while -- I can't wait for my Windows Phone 7!