I've been working a Zombie Master map called Origin since July and hopefully, beta 6 will be the final one.
Because of this, I'm hoping to expand my map making skills and move on to making maps for other games like Left 4 Dead 1 & 2, Team Fortress 2, Portal, etc.
As for the Origin map, it'll be hosted on 2 servers (for now at least and more info will be shown later), so I hope you'll try out this new version of the map, I'll be reading the comments and if you want to post any suggestions, feel free to do so.
If you want to try out this map, here's the link.
Enjoy