I've not researched this to find out if all the numbers presented are correct, so for the sake of argument I will assume they are.

This video suggests we are being overrun by immigrants and that our population will sky rocket because of their birth rates.

Now I’m somewhat of the opinion that more people are better because you have more innovation etc, but I also believe we are experiencing some problems from this mass human migration.

I wonder if the pressure on the bottom end of the housing market is driving up prices and that the huge number of new laborers in the job market is keeping wages stagnant.  So we will experience higher costs from housing and other sources as we compete for scarcer resources (oil, natural gas, land) while having less money in real terms.

As a Libertarian where do I stand on this?  As I stated previously I think more people can spur innovation and can be a boon to the economy.  This of course assumes that new immigrants don't require many services from the government which unfortunetaly is not the case in our socialist country.  We provide many services to these people and their dependants.  So in a free society law abiding people should be able to come and go as they see fit.  However when these people expect/require services and violate the law to get here, by definition I have a problem with that. 

I have no problem with admitting an unlimited number of PhD's into this country for instance.  I have a slight problem though admitting an unlimited number of gardeners and meat cutters that will require my assistance because the Left in this country has decided to use the police power of the state to ensure my money can be forcefully taken from me and restributed to the "poor" (poorer then whom?) and "those less fortunate" (less fortunante the whom?). 

So because many of these people will be entitled to the wealth of the current citizens I don't believe the pure Libertarian argument would apply in this situation.

Here is the link, hang in there the beginning is slow but the visuals are worth it ( kind of like an acid trip ;) ):

Visual Demonstration of Immigration to the US