Other pick up lines...hmmm...I bartended for a long time and found "hello" to work really well (on both sides of the bar). I am not sure there is really such a thing as a "pick up" line -- I heard it once as an "open" because basically you need a reason to talk to a girl. If I don't see an open I won't approach (usually) because I think it has to be natural and spur-of-the-moment. Basically I think you want to keep it friendly and joke around thats the best way to get to know a stranger -- make her (or him) laugh.
Some "opens" are completley incidental however. For instance, I was at a club the other week and there was these two Benson & Hedges girls there. I had went out on a date with one of them a couple of years ago but could never remember her name so I asked her partner. She was disarmingly friendly and we ended up talking all night.
While I am at it I thought I would give some advice to some guys who are a bit shy, or who feel the have "no game". First thing, don't just talk to a girl to score -- talk to everyone -- guy, girl, attractive non-attractive. It'll get you into the social swing. You need to get used to talking socially and off the cuff. Think of it as practice for the big game -- if you save it for the big day you are bound to "pull a hammy" (hammy = hamstring -- a phrase used when someone hasn't streatched out first).
The second thing is is keep it spontaeous and watch your body language. Don't act serious -- girls don't want to meet some serious guy in a bar, they are out to have fun. A few weeks ago I was walking out of the bathroom and this girl was walking behind me -- about 5 steps. I was able to get a quick glance at her and she was really quite cute -- this is key -- serious girls will often snub something like this. Anyways as I am walking up the stairs I cover my but with my hands, turn around and say, "will you PLEASE stop checking out my ass" of course I said it with a big smile -- turned around and went over to my friends. Throughout the night we happened to keep running into each other but the ice was really already broken. Of course you can say something like "are you stalking me???" but keep it light hearted. Anyways, some time later in the nigh we just sort of started talking -- very natural. When I said what I said the first time I didn't say it with intentions of picking her up I was simply being friendly -- keep it simple.
p.s. please don't use this for evil