Keen for this.
I've always wanted to play the Vechs' maps multiplayer, namely Super Hostile Race for Wool # 2 - Direct fire. Needs enough players to even teams and keep the action up but looks like heaps of fun.
[CTM][Collection] Vechs' SUPER HOSTILE Series - Minecraft Forum
* from the map page - My second multiplayer Super Hostile map. Two teams race against each other to complete a miniature Victory Monument! This map is more heavily focused on direct combat than the first RFW map, and has many TNT cannons and bow and arrow supplies to blast the other team.
Basically two identical lanes made in MCedit floating in the air, lined with cannons and stacks of bow and arrow supplies, within range of each other.
Not a straight forward race either, players need to be crafty, watch for mobs and projectiles from the other team whilst collecting the coloured wool to build the monument. Basic farms/food is supplied but the rest has to be found and crafted.
The only hard rule is you can't jump lanes to get at the other team, all the fighting takes place at range. Requires cooperation within teams and some quick thinking and building/crafting to win.
There are some great but long vids around of it in action.