Alert! Black Apples circling overhead, with guns!
Conspiracy theory here: Apple is doing this on purpose to test their defenses. They are also allowing tethering on version 3.0 regardless of what operators mandate, by simply editing a settings file. If they allow Skype over 3G, it's because they want to test the response from a reduced number of users to this "feature", i.e. the authorized developers. They can then come to the operators and either say "see, it wasn't that bad", or "hell, we need to remove 3G altogether from the phone, dude!".
The current 3.0 firmware is unstable to the point of making the phone unusable as your day-to-day device. It locks up, sounds don't play or are broken up, it suddenly starts heating up and drains the battery in minutes (stuck background process, anyone?), you cannot force-quit apps like mail or iPod by keeping home pressed...the list is very very long.