Want to read Comment
Chibi Vampire (manga by Y. Kagesaki) After watching the anime (Karin) I really want to read the manga.
Cutie Honey (manga, '70s) I watched the anime first and now I really want to read the manga.
Rosario + Vampire (manga)

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Higurashi no Naku Koroni (manga) Excellent Wow! I think I like this better than the already great anime. It's a bit less graphic and easier to take in as well. Not by much, though.
(The) Melancholy of Haruhi Suzumiya (manga) Bad Wasted oppurtunity. The disjointed, twisted story makes absolutely no sense (a conversation Kyon and Haruhi had at the anime's beginning now happens much later, Yuki and Ryoko's fight is closer to the beginning and happens before Mikuru and Koizumi enter etc.) and the art style is messed up, looks smudgy and devoid of charm. Don't get me wrong, I'm a gigantic Haruhiist but I absolutely HATE this!
Naruto (manga) Awful Basic. Generic. Formulaic. Just like the anime which I didn't like either.
Samurai Deeper Kyo (manga) Very good Enjoyable enough.
Yu-Gi-Oh! (manga) Good

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Full Metal Panic: Overload! (manga) Decent Eh, okay. A bit too chaotic for its own good.
Fullmetal Alchemist (manga) Excellent MUCH better than the anime! If you want to get into FMA you should do so via the manga, NOT the anime.