I'll nominate all my favorite battles and CTFs this year. In no particular order.

Best Battles:
Lut Gholein - Snooze
Deinspirated Mayhem - Eigus
Underworld - Eigus
Pleased with Presents - FawFuL
Triton Armory - Purplejazz
Starlit Basin - Ragnarok
Rainforest Revelry - Ragnarok and cooba
Surreal City Scenery - Snooze
Agony Void - P4ul

Best CTFs:
Chemical Gases - FawFuL
Server Room - Ktos
Steam Machine + Landscape - Snooze
Junkyard Blues - Snooze
Golem Landscapes - FireSworD
Xyzzy - Superjazz
Technologized Sonicwaves - FawFuL
Fort Medina - Napoleon
Mt. Helens - Superjazz
Sanguinary Sanctuary - cooba
Dubbed Marine - Crimiclown
Snowy Cave - Spaz18
Destroyed Cassis Factory - Snooze

As for best customs, I nominate Hitch's pack =P.