don't go, mon..

For people in engineering positions especially, leaving with no notice is pretty much dousing the bridge with gasoline and lighting it.  There's far too much knowledge transfer and loose end tying that needs to happen and in many jobs, you cannot do this beforehand without making it blatantly obvious you are thinking of bailing.  (Which is bad of that job offer falls through.)
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[ucblockhead is] useless and subhuman

It's pretty much Elves, Gods who love elves, Valuable Shit that Elves make and a handful of Uebermenschen who suck up to Elves. You will be sorely disappointed.

"To this day that was the most bullshit caesar salad I have every experienced..." - triggerfinger

The worst one I ever saw was calling someone AT HOME and telling them not to come in, we'll mail you your stuff.

I'd always try to give 2 weeks notice, it seems the reasonable thing to do. But as the guy says I'd have my own stuff cleaned up and home before I gave notice.

I agree notice is an option.  I think you have to play it by ear.  If there is any chance your opportunity or opportunities might be endangered by giving X notice before leaving, don't.  Companies keep you because they think it is to their advantage, you stay because of that, leaving should be just the same. 

My last resignation involved a professionally written letter that was short and to the point, with the image of Beaker from Sesame Street on it looking shocked.   My boss loved it.  The HR folks wanted me out that very day, probably because I raised hell because they failed to get me health care benefits for several months after promised.  She told them she would do it, but they were such a messed up company they didn't know that she kept me on for a couple weeks more.  The HR dude who ordered me gone that day greeted me in the halls most days, he didn't know who I was.  My Bosses bosses just played willfully dumb, they wanted me around as I actually made money unlike most folks filling my role.  Had I needed to leave right away I would have done it at a drop of the hat but in that case it was worth the extra money before moving and no harm to my new opportunity.

Despite my strong disdain for that previous employer I never did anything I thought uprofessioal.  I thought they treated people like trash, but I was working there I figured I'd take the high / safe road.   I didn't want to dork other things up (like other jobs) by taking revenge or something silly like that.   Other folks who worked there didn't do the same.  It became tradition that after a long night of drinking employees leaving the company would drive back to work and pee on the building. 

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