I expect Shivers to be along soon.
Check the ScummVM v2.0 compatibility list.http://scummvm.org/compatibility/2.0.0/
Riven is now on the ScummVM list too, along with Myst and Myst Masterpiece.
So if you have the disc versions, they should be easier to play using ScummVM.
Shivers, RAMA, and Lighthouse are all now supported by ScummVM, but not Shivers 2 (not yet anyway).