I like a lot of the logos of the 70's and 80's... the tripped out bubble letters... crazy art like the concert posters of that time.
I'd have to say as a rule, my favorite logos that have nothing to do with surfing... Skip Frye's wings... the Bing logo is cool... the old Mark Richards Designs logo with that bad a$$ lizard... the Gordon and Smith logo is classy. Even the Rusty R is kinda cool as a simple graphic.
If it has a wave or a surfboard in it, it has to be hidden... camouflaged so you have to really look to see it.