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Ai Yori Aoshi (manga)
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.
Masterpiece
Boogiepop Dual (manga)
An original two volume Boogiepop where Boogiepop has moved on to someone else. This time a male student.
Very good
Boogiepop Never Laughs (manga)
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.
Excellent
Chobits (manga)
Another great romance manga, with some interesting social commentary, and humor.
Very good
Code Geass: Nightmare of Nunnally (manga)
An interesting alternate take on Code Geass.
Very good
Crest of the Stars (manga)
Manga adaptations of the series which adapt the nevels good, but watching the anime or reading the books would be better.
Excellent
Dogs: Prelude (manga)
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.
Excellent
Gunslinger Girl (manga) Very good
Hellsing (manga)
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.
Excellent
Infinite Ryvius (manga)
Don't bother with this just watch the anime it's way better.
Good
Kannazuki no Miko: Destiny of Shrine Maiden (manga)
Good, but again the anime is way better.
Good
Kare Kano (manga)
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.
Masterpiece
Midori's Days (manga)
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.
Very good
Mobile Suit Gundam Wing: Episode Zero (manga)
An interesting prequel to Gundam Wing.
Excellent
My-HiME (manga)
Well it has boobs and other fanservice which is about it's only good selling point. Everything else is pretty weak.
Good
Planetes (manga)
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.
Excellent
Scryed (manga)
This was even more ridiculously over-the-top then it's anime. Some plot points were just too contrived.
Very good
Star Wars Episode I: The Phantom Menace (manga) Very good
Suzuka (manga)
Overall, a pretty good romance series. Now if someone would release the last 3 volumes in the states here.
Excellent
Tsukihime (manga)
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.
Excellent