Loved the Monkey Island series, I had MI2 copied for the A1200 which was a laugh with only one floppy drive and 13 or 14 disks (weren't even 1.44mb I don't think - if anyone remembers them from back in the 90s?!)
Got MI3 and 4 for the PC, 3 was a right laugh but I got really stuck on 4 and wasn't too keen on the updated graphics.
I see as well as the updated original (which I've played on the xbox and it's awesome), that they're releasing the 5 part series on WiiWare as well, so I'll be downloading that as soon as I can, I think the first part was released today.
Grim Fandango was pretty cool as well, and I played Hook quite a lot (although don't think that was LucasArts), and if you like MI, then there is a funny game in the same style called Gilbert Goodmate and the Mushroom of Phungoria if you can find it anywhere!