Can you provide more data on that?I don't know anything special that hasn't been all over the news anyway.
Basically, the US government seems to be actively trying to compromise data held by US businesses on non-US citizens. That same US government has made it clear in public statements from the highest levels that they don't consider foreigners to have any privacy rights at all that should prevent this.
Given that this all happens in secret, any promise made by any business operating in the US that they will safeguard personal data of non-US citizens to the standards required by European law is now known to be worthless, even if it was made with complete sincerity.
This is now common knowledge, and anyone controlling personal data in Europe would have to take it into consideration when applying the general data protection principles. In other words, any legal cover afforded by the Safe Harbor scheme may not be worth anything any more. (In case your question was intended to be about the Safe Harbor programme itself: This was created so that US businesses can be used to process personal data from Europe, as long as the US business promises to uphold similar data protection standards to those required by law of European businesses.)
So the bottom line is that as a European business, if you don't have adequate disclosure when you collect any personal information that basically says it might be exported to somewhere without any safeguards on how it's used, and you don't get prior informed consent from everyone whose personal data you are dealing with, you might be on the hook legally for regulatory non-compliance as well as for any actual damages that result from any breach. Whether it's possible to give prior informed consent to a carte blanche handling of the data is itself debatable.
(Just to be clear, my comments in this thread are based on the perception of the current situation as I have encountered it anecdotally in a few cases. Some of the people I've spoken with may have taken legal advice, but what I've described here is not based on formal legal advice I or any of my own companies have received. Please consider these notes as food for thought only and for goodness' sake don't rely on them instead of taking proper advice if these kinds of issues might actually affect you.)