The new Cyanogen release is now out and officially supports the Samsung Galaxy S2! Read all the details of the announce but also don’t forget to take a look at the changelog.
I was on the nightly builds since mid-july but it is nice to see a stable release out there. You can download it there. Last but not least, the install guide. Enjoy!
From the plain ROM no, but there are several players on the market which will do a perfect job for this.