I would also suggest Las Vegas Weekly (www.lasvegasweekly.com). A hard copy is distributed on Wednesdays and you can find it in some casinos. This gives you current info on what's happening that particular week.
If you are specific in what you're looking for (i.e. shows, restaurants, gambling, hotels, etc.), a post on the relevant forum (assuming you're a paid member) will get you a good amount of info from seasoned visitors and locals.
Other (free) message boards are Vegas Message Board (www.vegasmessageboard.com) and LV Advice (www.lvadvice) which can provide similar info.
Happy hunting!
Dan