If anyone actually reads what I post along this thread, they'd have known the truth by now. Let me take some of those points over again:
The Mayan calendar does not end in 2012. Only the short count, which the Mayans didn't even use, will reach its '31 december 1999' on that day. This is called the end of a baktun, a period that is written as 13.0.0.0.0. Now, we don't need to worry, because there are far larger units than that in the calendar. So, the long count calendar will just flip to 1.0.0.0.0.0. Since short count calendars only indicate 5 digits, that will look like a total flip to us, but it isn't. The Mayans wouldn't care. They've extended their calender a lot of times because they just didn't account for the fact they'd be around so long (their original Mayan calender accounted for less than a year, which they extended to 52 years, and then to the current system). According to most sources, the next unit of the Mayan calender (piktun) wouldn't run out until around the year 5000. After which it will just flip over to the next unit.
The lining of the galactic stuff will not affect the Earth magnetism. Heck, the sun shifts its magnetism once in 7-12 years and we don't mind that. Also, since the inversion of our magnetic field has recurred on seemingly random times in the past, there is no way to say we're overdue (although most claim it to happen within 4000 years).
According to some patterns that one could see, we could be, but seen the completely irregular distribution of the inversions, I would not think so. Also, there is no proof whatsoever that the magnetic field would completely disappear. Actually, the dinosaurs survived several inversions of the field. All we know is that it is possible for it to screw up our communications. Most scientists believe that ionisation from the sun might give us shielding from its own UV.
For Yellowstone Park, also, there is no indication that it's going to blow. Consider that the geysers and all the activity around the place are keeping the super volcano under-pressurized for a true eruption. As far as I know, every serious scientists claims the area to be totally safe. If anything, an Earthquake could trigger a minor eruption (not a major one, again due to lack of pressure). Keep in mind that it is the most monitored super volcano you'll find around.
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