You can play all the classic LucasArts games by downloading and installing ScummVM.
You will need content from the original CDs - the games are not free. The engine is an open source code project released under the GPL (General Public License) so I'm sure I don't incur anybody's wrath by posting links to it... If I do let me know.
As a sidenote, ScummVM has a version for Linux and Macintosh...
I can play Full Throttle on my NC-10. How cool is that?