I was on one of the many threads where parents are discussing taking children out of school, and someone mentioned how it was good practice never to miss school, because you certainly could never miss your college classes.
That surprised me....not one professor ever took attendance when I was in college. All that mattered was you did the papers, projects and passed the tests.
I attended every class as a freshman, almost every class as a soph, would skip if it was raining as a junior, and if it was sunny as a senior!
How about you?

I had a professor who would give bonus points when only a few students showed up to class. If you didn't show up, you got a 0/0 but if you showed up you'd get a 10/0 or 25/0 or something. It showed up on the online grade database too. I loved those bonus points!Some of my professors took attendance, some didn't.
I took a political science class last semester that had about 50 students and the TA's took attendence during the class. The room was a mini auditorium (only seated about 250 as apposed to 500+) and we all had assigned seats. The TA's had the seating chart and took attendence while the professor lectured. The class was graded on a points system, and attendance was worth 50 points. If you missed 0-3 classes you got the full 50 points, 4-7 missed classes got you 25/50 points, and anything more than that you got a 0. That class was so incredibly boring and nothing the professor ever lectured about was on the tests, but I had to go to class anyway for the grade.
Most professors that don't take attendance give extra credit randomly through the semester to the people who showed up on that particular day.
I had a horrible professor last semester that made up assignments for the people who were absent. There were about 50 of us in the class, and she knew all of our names by the end of the first class, so it was obvious if someone was missing. If someone was missing, she gave those people a 0 on the made up assignment, but didn't give those of us that were there a grade for anything. It was horrible.

Never even considered missing. 
) 3 essays due and 3 midterms on the same day and I felt if I could space it out a little better (I was not getting the information i needed to do the essay very far in advance so I could not just get them done early) I could do much better. In the other I also had several things happening schoolwise at once and it fell the Monday after a wedding I was in. In both instances the professors had no issue giving me the extension but I recall both commenting that this was due to me asking early, AND always being in class and participating so they knew I was not just fooling around.You really needed a "some did some didn't" answer for the poll--seems a lot of us are giving that answer.
It was primarily my literature classes which took attendance--so much of the class is discussion you really need to be there to be learning. Some profs truly took attendance (or had a sign in sheet), others just looked to see who was there (I had a couple of very small grad level classes with 10-15 people max.) and one had a mini essay (had to fit on one side of a large index card) about the reading due every class. He often pulled one out and asked you about it--so even if someone had sent it in with a friend it could have been obvious you were not there.
I missed classes once when I was sick. I recall calling or emailing every professor whose class I missed BEFORE the class time to let them know and i left a day early for spring break once--after clearing it with everyone's classes I would miss. I also asked profesors (well ahead of time) on two occasions if I could turn in an essay late. In one instance I had (I think--it has been 15 years since I graduated) 3 essays due and 3 midterms on the same day and I felt if I could space it out a little better (I was not getting the information i needed to do the essay very far in advance so I could not just get them done early) I could do much better. In the other I also had several things happening schoolwise at once and it fell the Monday after a wedding I was in. In both instances the professors had no issue giving me the extension but I recall both commenting that this was due to me asking early, AND always being in class and participating so they knew I was not just fooling around.