same here, I did it not too long ago and have no idea why I waited so long. It was really simple
Actually rockbox is one of the reasons I started developing FLAC Player. I still have a rockboxed 5g (Video) iPod.
It sounds great, but it doesn't always sync right and I think the hard drive is dying.
I could have replaced it with an iPod Classic but they don't sound as good and can't be rockboxed.
So instead I spent the better part of a year working on an iPhone app