We’ve known for quite some time that Hulu was working on a paid service, and the time has finally come. Hulu launched Hulu Plus today. It’s both ad-supported AND requires a subscription. Hulu says this is revolutionary.

Here are some details to know about Hulu Plus:

1. It’s available on select Samsung Internet-connected TVs and Blu-ray players. This requires you to download a Hulu Plus app from the Samsung app store.

2. It’s available on the iPad. You can access it via Wi-fi or 3G.

3. It’s available for the iPhone 3GS, iPhone 4, and third-generation iPod Touch. Again, you can stream over 3G or Wi-Fi.

4. Subscribers will be able to stream all native HD content in 720p high definition.

5. It costs $9.99 a month.

Note: It’s available for Mac/PC as well

"These are the devices shipping with Hulu Plus today," says Hulu CEO Jason Kilar. "But this is just the first step in our mission to bring you TV wherever you are. We are already hard at work on porting Hulu Plus to other devices and platforms, with PlayStation 3 coming soon. But that’s a story for another day."

It should be very interesting to see how many people are willing to pay $9.99 a month for Hulu plus, especially since much of what is offered is also available through Netflix’s streaming service, which is available for free along with Netflix’s one-disc-at-a-time plan for $8.99 a month (without ads).

By the way, you have to be invited to use Hulu Plus right now.