Live from Twitter on this subject:
There's been reported severe issues and incompatibilities when trying to use mobile broadband connection software with the new version of Apples operating system for Mac called Snow Leopard.
The error occurring is a hard (kernel) crash of the Apple Mac operating system. In other words, access to Internet using mobile broadband is impossible. The Mac system itself survives, and there are no reports of data loss.
I have very little information so far, but affected connection clients reported until now are from Telenor (Sweden), 3 (Three) (UK) and O2 (UK).
I'm working on getting more info. Are you affected? Please let us know more in a comment below, and please provide:
* What you experience
* Mobile Broadband provider name (such as Three or Telenor)
* Country
* Operating system
* Computer type
[Update] Vodafone (UK) has problems as well.
[Update no. 2] Virgin (UK) also has problems.