It might be hard to find people familiar with Grooveshark to respond to this thread when you didn't include it in your title. Thread titles like "Anyone?" are pretty weak!
grooveshark is not OS6 compatible, write an email to vip support so they can write you an email when the app is compatible and hold your suscription until theres a compattible version with OS6.
unfortunately I don't know if Grooveshark will ever come to the Torch. I use grooveshark everyday and used to have it on my bold. When I switched over to the torch, I emailed support to see when they would update the app and they replied they weren't sure, if ever, they would provide torch support. If you look at the website, they don't even have support for the storm yet. Maybe if enough people bug em about it, they will make it happen.