What is the status of population at this year 2011 ?
As of right now, the population of the planet is 6.950 billion people. There are a number of sites that keep a running tally - I will include the links to them below.
Perhaps the more significant statistic is not the actual human population of the Earth, but the rate of change of that population. Ecologists believe that the planet and each environmental subdivision of the planet has a finite "carrying capacity", the maximum population of any species that can be sustainably supported. Agriculture has probably increased the carrying capacity for humans (though at the expense of other species - but that is a different discussion!) but now the population is growing so fast that there is some doubt as to whether we can improve life-supporting technologies fast enough to keep up.