I guess I'm weird. I don't really read a lot of the popular ones. I kinda got bored of Naruto. And I'm really tired of waiting for Bleach to continue.
That aside, History's Strongest Disciple Kenichi is one that I check regularly. Ruroni Kenshin will always be my favorite and closely behind it in second place the infamous and sadistically awesome Alucard (who would eat Edward and Jacob in a heartbeat, sorry ladies you know it's true). Freezing is an interesting one as well that I check up on now and again. I do like both of the Prince of Tennis mangas. They are cool and funny, as well as, Black Butler. Fist of the Blue Sky has my attention now and then on to Fist of the North Star for me. They look to be modeled after the martial art Dim Mak with is pretty cool to me.
In case you hadn't noticed, I like fighting mangas. LOL