Also, if you're interested, I've copied this text from the FreeSCI FAQ:
1.2 What are the differences between the SCI versions?
SCI0 was used in the first generation of SCI games, like SQ3, QfG1 (EGA) or KQ4. It uses vector drawn EGA graphics, MIDI sound, a complex object-oriented virtual machine, and a few other neat things. SCI0 games generally use a typing interface.
SCI01 adds digital sound effects to that, slightly improves mouse pointers, and uses a new compression type.
SCI1 games use bitmapped VGA graphics, more new compression methods, and replace the typing interface with a point-and-click interface.
SCI1.1 games are slight extensions of SCI1; at some point during SCI1.1, the ability to arbitrarily scale pixmaps was added.
SCI32/SCIWin v2 games run on a DOS extender or in the Win16 environment; they use a partially 32 bit engine. They are able to support resolutions higher than 320x200 pixels.
SCI32/SCIWin v3 games require a Win32 environment, but behave like v2 otherwise.
Another SCI relative, LSCI (Large-scale SCI) was used for the Sierra Network (aka the ImagiNation network). It was completely 16 bit, though.
