We already have a thread that discusses favorite mangas. No need to start a new one!
I believe this thread is in search for new fav mangas, not favorite mangas of all time.
my ex and I are on a quest to find a shoujo manga that beats
Hot Gimmick, we have yet to find one.
Hot Gimmick remains the best Shoujo Manga of all time so far.
I've also started to read
Aria which I was suprised to find I quite liked since it's not normally something I go for but I have been reading a lot of Slice of Life lately (
Genshiken, Yotsuba, Sketch Book, Azumanga Daioh, Lucky Star).
Also found some more Otaku manga, such as
Fall in Love like a Comic Book, Dramacon and my favorite new manga out of them all so far:
I-Otaku, Struggle in Akihabara.