These are great. I'm still pining for a (legal) collection of infocom games. The nicest one goes for well over $100-$150, and it stinks because Activision now owns the rights to most of them and hasn't done a proper re-release. What they did do is manage to release a collection for Apple ipad, a system without a native keyboard... I'd pay $10 bucks for a nice Steam release, all you have to do is come up with an nice interface, a way to browse the included docs and feelies (especially those of them that had clues/maps) and include one of many z-machine interpreters or write your own (super easy). I'd love a disc based release or hard copy of some kind but I know that's unlikely. I might start picking up certain ones for the extras if they are all there, maybe for the C64 as that's the most meaningful for me.
My first Infocom game was Hitchiker's Guide on the C64, besides that I think my favorites are Bureaucracy and Suspended.