I was a Doomer for a couple of years. Michael Ruppert's movie
Collapse was what inspired this, and I read and watched everything I could on the topic, from Hubbert to the IPCC reports.
Understand as well that I have always believed (from the age of 9 anyways, or about 1960) that human overpopulation was THE problem. It then follows that the damaged environment, the oil peak, sea level rise, polluted oceans, AGW (if real), etc etc are all symptoms of the real problem of human overpopulation.
I believe that the oil peak has happened and that within 50 years, everyone will know and understand what the oil peak means. Let me reproduce a blurry image from Hubbert's paper:

Hubbert of course knew nothing of the Internet and how it frequently exaggerates everything out of proportion. My actual beliefs about the oil peak (which I believe happened in 2008) are as follows.
1) There is a probability of 0.1 that an oil panic will happen in the next 10 years. As more time passes after 10 years, the probability of a panic about petroleum increases.
2) The probability of an oil panic will peak at about 0.9 in approximately 50 years. My date for TEOTWAWKI is therefore 2047 to 2067.
3) You need first plan, then begin and end your preparations for TEOTWAWKI in the coming decade, before 2027.
There is of course lots of information above and beyond Hubbert's initial insight (which was all about conventional wells):

But I do not understand the import of this. In fact what I actually believe is that the true state of oil availability is entirely a secondary concern, the real trigger event is the worldwide human panic that will ensue when everyone everywhere realizes what this oil shortage means.
Predicting the date of this panic with any accuracy is impossible, there does not exist a calculus of human behavior. My probabilities above are SWAGs (scientific wild-assed guesses) based on my 60+ years of observing humans. I pretend to no special knowledge, anybody else's SWAGs would be as good as mine, after an equal amount of obsession about this topic, of course.
In stating my position in terms of probabilities (which really and truly is how both engineers and weathermen think) I have actually avoided taking a position of course. I can't be proved wrong, at worst I have made a correct prediction with the wrong timing.
What I am actually hoping for is that a miracle will happen, and we will find a substitute energy source that will obsolete oil/gas/coal, and that this will buy us enough time to solve the problem of overpopulation. Unfortunately, my gut says that is "probably" not gonna happen.