Here we'll try to provide you with a list of things Excel Saga intentionally made fun of (as far as we can interpert the creator's intent). You are welcomed to pitch in on the effort, because we know, we blows at it. We welcome whatever useful help you can throw at our way. Right now it's going to be just an unorganized mess until someone help me out a bit here.
Star Wars
The Matrix
Titanic
Kohaku Utagassen (new years special)
Warner Bros (their animation)
Disney Animation
Fist of the North Star
Di Gi Charat
Rambo II
Sentai Shows (in general)
Doraemon
Cowboy Bebop
Lupin the 3rd
Sailor Moon
Aliens
Cosplaying
Tomato Juice
Excel Saga (the manga)
Rikudo Koshi
Giant Robo
Pokemon
"Weather Break" (Japanese weather update news thing)
Dragon Ball
Gundam
Starship Yamato (et al.)
Tokimeki Memorial
Sakura Taisen (the first Saturn game)
Black Jack (the Tezuka manga)
Sports Anime
Lassie (dog movies)
Ghost (the American movie)
General magical girl shows
Space Adventure Cobra
Geobreeders
Death
Around the World in 80 Days (movie)
Galaxy Express 999
Man in the Iron Mask (movie)
Night of the Living Dead (movie)
Hard Boiled Detective movies (Like Sam Spade et al. )
2001 A Space Odessy
Powerpuff Girls (Blossom)
Intel (Celeron 750)
Trigun
Speed Racer
Beyond Thunderdom
Terminator 2
Blue Gender (anime)
The Vision of Escaflowne
Microsoft Windows
Puni Puni Poemi (parody spawn anime)
Yu Yu Hakusho
Sugoi yo! Masaru-san (the sexy commando)
Old Mac monitors
Fox (company)
RoboCop
Rookies (sports manga by Masanori Morita)
Slam Dunk (same)
Neon Genesis Evangelion