My favorite project was called skytown (it no longer exists, since server shut down). As the name suggests, it was a massive town (somewhere aroun 256x256 upon completion) occupying the top 10-15 blocks of the map. It was all connected by a 20x20 wooden tower. There were 20-some odd homes, one for each member of the server, each customized in their own way (Members of the server gave me supplies in exchange for their homes). On the north end was a redstone park, which had 3 floors - 1st floor showed all the basic circuit types, 2nd floor was small projects, and 3rd floor was for my projects. On the east was a farmland, consisting of all the basic minecraft plants, with a "bar" at the end. The west was the storehouse, a large building where basic building supplies and tools were provided to new players on the server. The south consisted of a waterslide leading back down to the ground, right next to the underwater palace that I was also working on. The center also had a small park.
I rambled on too much...
@wapox - I really wish I could get into something else, but my desktop died and I am still waiting for new parts. In the meantime, minecraft away. (its also summer, so no dnd for me

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