XD
Shonen is a Japanese/Japanese-style comic made for boys - it's actiony. Dragonball and FMA are both Shonens.
Shojo is a Japanese/Japanese-style comic made for girls - it's a bit more towards emotion and stuff like that. Can't think of any familiar Shojos that you'd usually hear about, really... CLAMP makes a ton of Shojos.
~Nikira
And, based on what I watch:
Fullmetal Alchemist is Shonen
Ouran High Host Club is Shojo
(BTW, Ouran High is very funny, XD)
TMD