as far as an ice breaker , ever try the coast guard ? no? how about i'll let you shave mine if i can shave yours ? or , "youve seen mine , now hows yours doing ?or you didnt break a wing did you , when you fell from heaven ?
"Hey baby, I'm a big deal!" -Movie: Anchorman: The Legend of Ron Burgundy
Ive actually used this one a few times "hey do you know how much a polar bear weighs by chance? ... enough to break the ice, hi im ______. corny sure but youd be surprised how well it works
Lines are for losers....... be yourself.......be confident........and have a REAL sense of humor.......
I stand with Mike on this one.
Yea but I always like "I'll guess your weight if ya sit on my face and you'll win a prize"

But really, best thing to do is introduce yourself and comment "positively" something about her (not her boobs) or the surroundings. Really depends on the situation.
bad pickup-line-night is a good way to break the ice. they know you are not actually taking these lines seriously. but it gets them laughing. making a lady laugh is always a plus.
I'm with Burke on this bad line -idea. With a confident smile. Something so obviously corny that it makes laugh. But it doesn't work always.
What Tyler said, Strauss' book is fun to read and gives insight, but beware: use it only to give inspiration and insight, don't use it as instructional manual or you are making a huge error.