Couldn't remember if there were any other uploads I liked, so I just picked from the nominees.

2007's best JCS'er: DarkSonic
2007's best level pack: One Up by BlurredD
2007's best CTF level: Toxin Twister by Cooba
2007's best (non-CTF) level: Neobeo's Firetruck by Neobeo
2007's best tileset/tileset conversion: Desolation by BlurredD