That speculation about Hulu Plus requiring the PS3's preium online service PlayStation Plus, is valid, but only for a limited time.
When the Hulu Plus page launched, some clever people looked at the site's source code and found a line of text that suggested that when the PS3 gets the service, users will need to have an active PlayStation Plus subscription.
There was no such indication on the actual live site that the PS3 version of Hulu Plus required PS Plus, but the PS3 version isn't available yet.
So Hulu has put an end to all the speculation and confirmed that the PS3 will require PlayStation Plus, during Hulu Plus's trial phase.
In a response to Joystiq, Hulu confirmed, "The Playstation Plus service is only a requirement during the preview period."
Like Netflix, the Xbox 360 version of Hulu Plus will always require a premium Xbox Live Gold subscription.
Don't Miss: How to Find NES Classic at Target Stores