>which began serialization in '97 and is still running
If you think about it almost all those yonkoma SoL manga about 4 schoolgirls that got adaptations are still running. Sketchbook, GA, Hidamari, Lucky Star, Ichigo Mashimaro, Minami-ke, Hyakko and 10 others I managed to forget. All still going strong.
Of course not for almost 15 years by now (but Hidamari and Sketchbook began serializing around ~2004 if memory serves, I'm too lazy to check it, though) but you get the point.
 I realized that Ichigo Mashimaro must've been around for even longer (since it was adapted in 2005 and all) and sure enough, it began serialization in 2001. It bugged me a little afterall but I wasn't too off about Sketchbook and Hidamari - 2003 and 2005.
Post edited on 22nd Dec 2011, 8:10am