No more though.
They finally made the announcement last week on the official Google blog that original content will definitely be a determining factor in search rankings.
So how will this affect you. If you have a bunch of spun articles on article directories they may get wacked. If you have one of those news aggregator sites or have a similar auto-generated site they may be affected also.
If you have been in the internet marketing game this should be par for the course with google. They are always changing. A few years ago a lot of people got adwords slapped and lost a huge chunk of their business if they were dependent on this. During the same time period if you had a bunch of adsense sites you've probably noticed their CPC payout has gone down considerably. Paying for email may even be in our future if msn and yahoo have their way.
This is why you need to be constantly evolving as well. There still is a ton of money to made on the internet and likely will be for a long time to come. Just because you have a successful site or maybe even a couple doesn't mean you can sit on your laurels.