I'm glad you made this thread because I'm interested to see what other people from LV have to say, but I have done a decent bit of homework and am fairly certain about the laws in general. All I can do is tell you what I've found and heard from talking to other people (and from the interpretations of many other people based on the actual written statutes), but ultimately you have to decide for yourself and obviously I can't be held responsible for anything.
It's a little bit tricky because you have to first follow State law, then city/county ordinances, and on top of that, you have to follow the ordinances of an establishment. Obviously it's a bad idea to bring your knife into a bank, maybe a mall, and definitely events like concerts and any place where you know it's not allowed. But you have a pocket knife clipped to your pocket, you probably won't be harassed for bring it into a grocery store or whatever. As long as you're following State and County ordinances, I'm fairly certain that all an establishment can do is ask you to leave or "remove" you.
Anyway, here's what I've basically determined, but again, it's your responsibility to decide what you want to carry and I'm not a cop or a lawyer or anything like that:
-the big thing seems to be automatics. They are illegal to even own, and especially to carry.
-I'm not positive whether or not "assisted", like a Kershaw Speed Assist flipper knife, counts as automatic, but I'm fairly sure they don't count because you manually initiate the opening of the knife by pressing the on the blade (the flipper) or the thumb studs and the spring only carries the blade to some extent if you've put enough force into it. They aren't actually automatic because they aren't actuated with a button and either way, the assist won't carry the blade open entirely if you haven't initiated enough centrifugal force.
-I know it's illegal to sell actual automatics in LV, but I see assisted knives sold all over the place and I bought an assisted opener recently at Bass Pro Shop and the salesman was certain they were legal.
-It's illegal to conceal a knife with a blade 3 inches or longer.
-Other than not being able to conceal a knife 3 inches or longer, I haven't heard anything about a blade size limit for knives that aren't concealed. I would think a big fixed blade would be illegal, but I don't know. I just generally won't carry a folder that's much over 4 inches, personally. I feel pretty comfortable as long as it's on a clip and not covered up.
That basically seems to be the gist of it. Don't carry anything 3 inches or larger unless it's visible. Don't carry anything automatic. Assisted is probably okay but you'll have to decide for yourself. I haven't been EDC'ing in Las Vegas for a very long time, but I basically just carry manual (or sometimes Kershaw Speed Assist) folders on a pocket clip with blades between 3 and 4 inches and use some common sense and I believe I'm within the law. However, I don't know how comfortable I'd feel taking a knife down on the strip. It may be perfectly legal, but ultimately it's the cop on the street that will decide.