Leaving data roaming ON while abroad: what apps use data in the background?

As a quick preface, I've had an iPhone since Week 1 in the summer of 2007. I've been working outside the U.S. for well over a year now, so I've been roaming with my iPhone for almost the entire time I've owned it. I had kept data roaming turned OFF since the fall of '07, when a software update brought it as an option, but visual voicemail continued to work as always even when data roaming was OFF (under software versions 1.x).
After hearing about the early bugs with iPhone software v2.0, I stuck with the last version of 1.x until about a month ago. While I like almost everything about 2.2, I was dismayed to notice that visual voicemail no longer worked if data roaming was turned OFF. (Apparently, the visual voicemail "loophole," for lack of a better phrase, was closed with 2.0 or a subsequent version of the software.)
This has left me facing a conundrum: Turning data roaming ON might leave me susceptible to a big data roaming bill, while leaving it OFF leaves me in the dark as far as the existence and Caller ID of new voicemail(s).
QUESTION: Does anyone know of the DEFINITIVE list of which iPhone apps use data roaming in the background? That is, if I leave data roaming ON but NEVER use the email app or Safari or YouTube or any other app that accesses the internet and would incur data charges (or, at least, never use any of those apps unless connected to a WiFi network), which apps will use data in the background anyway, WITHOUT me actually launching the app?
Back in the 1.x versions, I'm not aware of any apps that used data unless the user actually launched an app, but I've noticed that, under 2.2, Apple's App Store app routinely connects to the internet on its own to check for updates if I have data roaming enabled. (I'd like to turn this OFF, but doing so doesn't appear to be an option.)
I'm hoping App Store is the only app that has this (bad) behavior, and that I'd be safe leaving data roaming ON while consciously avoiding using data over the EDGE network, but I have no idea if apps like Stocks, YouTube, Weather, etc., have been updated, in 2.x or even 2.2, to check for updates in the background, and thus run up data roaming charges.
If anyone can shed any light on this, it would be much appreciated. Thanks very much.

The iPhone is officially unlocked and can be used with whatever provider/SIM card.
But imagine, we are a team of around 20 people, travelling to all kind of different countries all over the world (changing, not the same person is always travelling to the same countries), and of course (I didn't mention this in my first post), we also have to stay in contact by phone. In addition, also whatsapp is based on the phone number as far as I know, which is our main "quick" communication tool. It would never work out that all of us inform the others all the time about the changing phone numbers, depending on which country each individual is at the moment.
Your answer unfortunately just confirmed what my researches so far resulted in... there really seems to be no apple-like easy solution to manage data roaming for apps individually. In the beginning I was sure to quickly find something in the appstore, since I assume my situation is not such an exception. I guess I have to start learning how to program apps! :-)
Anyway, thanks for your answer! As I mentioned before, every idea is appreciated.

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