when i was little, i used to be hardcore into comic strips. i have like 100 comic strip books and i've read part of just about everything. i still check for the comics whenever someone in my family buys a newspaper :')
some of my favourites, past and present: Calvin and Hobbes, Life in Hell, Retail, Dilbert (The Dilbert Principle was like my favourite book when i was like, eight), Garfield (its not as funny now that Jon has a gf), For Better or For Worse
as for webcomics, all i really read consistently is CAD. i've read vgcats, super effective & awkward zombie, but i don't follow them super closely.