Some people here have already given good answers regarding leap year in the Mayan calendar. But the Mayans actually had three calendars: one that was essentially a solar calendar, another that was a religious calendar, and a third calendar that was used for keeping historical records. This third calendar is the only one that's relevant to your question, because this is the one that some people are using to predict the end of the universe.
This long-count calendar isn't a calendar as much as a counting system. You know how we use a base-10 counting system? (10, 100, 1000, 10,000 etc.) The Mayans used a modifed base-20 counting system for keeping track of days - the second cycle went up to 18 rather than 20. So they tracked days in cycles of 20, 360, 7200, 144000, 2880000, etc.
We're coming to the end of one of the 144,000 day cycles. The concept of leap-years is irrelevant to this calendar system, because it's not based on solar years, simply on pure math. I've got no opinion of whether the calculated date of Dec 12, 2012 as the end of the cycle is accurate
I don't think there will be suicides that day, this isn't a date from some religious cult.
Sadly, there will be suicides that day. I can almost guarantee you. Most likely some people are going to be paranoid as **** thinking the world is gonna end and.. well yeah. Sad but true, some people really are that stupid.
I can picture it already. I get trapped in a building, as the rest of the world is burning to ashes. Then suddenly a HAWT soldier rushes in. I am laying all pathetic on the floor. He picks me up as i feel him up. Pretending to be semi-unconscious i feel his 3rd leg. He checks if am alright then i kiss him. It then escalates and we have sex. We then survive and become soul mates.
There are more signs occurring ... The storm Sandy will hit soon and a 8.8 earthquake hit Canada Today, they are waiting for the Hurricane ... GOOD LUCK TO EVERYONE
There are more signs occurring ... The storm Sandy will hit soon and a 8.8 earthquake hit Canada Today, they are waiting for the Hurricane ... GOOD LUCK TO EVERYONE
How freaking inaccurate. Worse things happen in Asia and Africa everyday and because of a singular strange event happening in some sectors of North America everybody freak out saying it is the end of the world. Too many movies about apocalypsis I guess.
Most likely some people are going to be paranoid as **** thinking the world is gonna end and.. well yeah. Sad but true, some people really are that stupid. 
Yes i am ready...
