WARNING!: Comments may contain SPOILERS and/or foul language. Viewer discretion is advised.

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Infinite Ryvius (manga) Good
Don't bother with this just watch the anime it's way better.
Kannazuki no Miko: Destiny of Shrine Maiden (manga) Good
Good, but again the anime is way better.
My-HiME (manga) Good
Well it has boobs and other fanservice which is about it's only good selling point. Everything else is pretty weak.
Boogiepop Dual (manga) Very good
An original two volume Boogiepop where Boogiepop has moved on to someone else. This time a male student.
Bunny Drop (manga) Very good
This was a decent story about an single guy learning to be a parent, when he decides to raise a relative's child no one wants. Although, in the end it turns into a strange romance title, when the daughter finds out she's not related to him, which I was okay with but it's kinds gross.
Chobits (manga) Very good
Another great romance manga, with some interesting social commentary, and humor.
Code Geass: Nightmare of Nunnally (manga) Very good
An interesting alternate take on Code Geass.
Gunslinger Girl (manga) Very good
This was a very good character piece, but good god is it depressing. Pretty much everyone is dead by the time the manga ends.
Midori's Days (manga) Very good
A ridiculous premise, but it actually manages to successfully combine some laughs with some serious character development to make a decent romantic comedy manga. I really thought this ended great as well.
Scryed (manga) Very good
This was even more ridiculously over-the-top then it's anime. Some plot points were just too contrived.
Star Wars Episode I: The Phantom Menace (manga) Very good
Black Bird (manga) Excellent
This was a pretty good supernatural romance. I also liked the character art.
Boogiepop Never Laughs (manga) Excellent
Adapts the novels, which were good, so by default this gets a passing grade, but why not just go read the novels instead? They're better.
Crest of the Stars (manga) Excellent
Manga adaptations of the series which adapt the nevels good, but watching the anime or reading the books would be better.
Dogs: Prelude (manga) Excellent
Also known as Volume 0 as it was released here in the states. Good action manga though it just sets up the situations and characters for the longer sequel manga series.
Hellsing (manga) Excellent
Badass action manga. I prefer Hellsing Ultimate the anime adaptation though, simply because with black and white you can't really tell what the hell is going on half the time since the blood is black and so are the backgrounds.
Mobile Suit Gundam Wing: Episode Zero (manga) Excellent
An interesting prequel to Gundam Wing.
Planetes (manga) Excellent
This is a tough call. While I aplaud the manga for going into the backgrounds of the characters more and continuing the story further along, I also found it to be kind of dry. I thought a lot of this series just clicked more with me in it's anime form.
Suzuka (manga) Excellent
Overall, a pretty good romance series. Now if someone would release the last 3 volumes in the states here.
Tsukihime (manga) Excellent
This was better then the anime because it had a lot more action and character depth as well as explained more things. It still follows the same old stupid depressing Arcuaid route though. I was really hoping it would go with the other Arcuaid route or one of the Ciel routes.
Ai Yori Aoshi (manga) Masterpiece
This a fantastic romance manga with great conclusion. Although, it does get side-tracked in the middle. I enjoyed this way more than the anime version which did not adapt all of it. The ending was really great too.
Kare Kano (manga) Masterpiece
This puts it's anime adaptation to total shame. This is much better in comparison, both for resolving the main relationship as well as all the other character relationships in the manga as well.