If you watch Anime, here are the ones that have captured my attention. ^_^
(Mostly in the order they were discovered)
Sailor Moon (Was this not the first for everyone?)
Dragon Ball Z
Pokemon (the good ones, back when there were only 151 critters)
Tenchi Muyo
Trigun (AWESOME SHOW)
Generator Gawl (really good SciFi)
Magic Knight RayEarth
Gundam Wing (this would be my guilty fandom pleasure...)
His and Hers Circumstances (It's good until the end)
FullMetal Alchemist (really, really good show)
Fruits Basket (love it)
Ayashi no Ceres
Fushugi Yuugi
Naruto (you actually have to watch it all...just one episode and it won't seem like much)
Rurouni Kenshin and Samurai X
Bleach (This one I am currently working on watching)
Pretty Guardian Sailor Moon (not actually an anime, it's live action, but it's one of my favorites)
Vampire Knight (My new fave, and currently airing in Japan)
Death Note (I've only seen peices, but from what I've seen, really different and cool)
- Basilisk (and with it the live-action movie, Shinobi)
- Ouran High School Host Club (OMG fabulous. ^_^)
- FullMetal Alchemist Brotherhood (currently airing, a redoing of the series, more closely following the manga)
There are others I've seen, of course, but these are the ones that I really like. The number I've seen but just never really got attached to is probably close to the same as above or higher.