Jukka Jylänki has ported ScummVM's SCUMM engine to HTML5 using enscripten.
Head over to the website and you can play demos of Maniac Mansion, Loom, The Secret of Monkey Island, Indiana Jones and the Last Crusade, Indiana Jones and the Fate of Atlantis, Day of the Tentacle, and Sam & Max Hit the Road directly in your browser!
OzzieMonkey
Nice. Unfortunately I can't get the sound to work though, not sure what's up there
I believe sound requires Firefox.
Jason
The link to the LucasArts web site for official "purchasing options" is the equivalent of three score and ten feety pajama-wearing bunny rabbits in adorability.
Hopefully one day that link will change to one that will lead us to Good Old Games. As it is, Ebay would be more helpful :p