Many a wannabe designer has tried, but few have done it. That is, completing a fangame. Zak McKracken 2, after 7 years in development, has been completed and is now available here.
Unfortunately, it's only in German right now. They are apparently looking for English speaking people to do the lines for the English version, so if you think you can do it, get in touch with them!
Source: Zak 2 homepage
The source material alone would make this worth checking out
hehe, its about time Mojo had a post about this :P