This is just here to keep track of animes and mangas I thought was pretty good.
Of course there will be series that's both in anime and manga. If I put them down in one category, that either means I like that one better then the other or I only read/watch that one and not the other.

MANGAs
Air Gear
Beauty is a Beast
Bleach
Bride of the Water God
Fruits Basket
Gakuen Alice
Eyeshield 21
Loveless
Kateikyoushi Hitman REBORN!
Sex Pistols (yaoi)
Skip Beat
NANA
Naruto
Ouran High School Host Club
Prince of Tennis
Tsubasa: Reservoir Chronicles
Until Death Do Us Part
Yakitate Japan!
Yu-Gi-Oh
XXXHolic

ANIMEs
Baccano!
Beck
Code Geass Lelouch of the Rebellion
Code Geass Lelouch of the Rebellion R2
Get Backers
Gokusen
Gravitation (yaoi)
Innocent Venus
Kaleido Star
Kaleido Star: New Wings
One Piece
Paradise Kiss
Tengen Toppa Gurren Lagann

I'm pretty sure there's more out there that I like...
I just don't remember...

Do you guys have any other recommendations?