I decided to make this topic for put together all my previous most important topics for bugs, and for update it instead of create always a new topic.

Chapter 1: Details suddenly appears.
I have this annoying problem. Details on things, especially walls, seems to appears suddenly when I get closer to it. I also tried to maximize Distance of Details from options, and change all values with the word "LOD" in SkyrimPrefs.ini but don't work. Seems to be a bug that afflict almost all or ALL Pc.
Look at the pics. I took it outside Whiterun, near the entrance.
http://img.techpowerup.org/111118/TESV 2011-11-18 13-43-18-92.jpg This wall seems normal, but....
http://imageshack.us/photo/my-images/404/tesv2011111614494298.jpg/ Look at walls near wooden platform when I get closer. White bricks appears on sides of walls near the platform.
But next pics showing this problem better.
http://imageshack.us/photo/my-images/440/tesv2011111614502673.jpg/ Again, this wall look good, but when you go closer...
http://imageshack.us/photo/my-images/820/tesv2011111614504138.jpg/ some details seems to appear on the top of wall, and...
http://imageshack.us/photo/my-images/259/tesv2011111614503403.jpg/ get a little closer and definitely appear some foliage on the top.

Chapter 2: Wave of light, squared blocks, particles and debatable choices of gameplay.
Do you know the Wave of Light? No, it's not a new ultra powerful powah spell, but just the umpteenth bug
It's a line of light that follow the movements of your character. If you go ahead, also it go ahead.
Watch these pics for understand what I'm speaking about.
http://img.techpowerup.org/111117/TESV 2011-11-17 20-40-01-64.jpg Red arrow indicate it
http://img.techpowerup.org/111117/TESV 2011-11-17 20-39-55-58.jpg Look in the middle of the two ramp of stairs
http://img.techpowerup.org/111117/TESV 2011-11-17 20-39-12-13.jpg I plake a red line to shows it better.

And what about squared walls...? http://img.techpowerup.org/111117/TESV 2011-11-16 20-00-01-76.jpg

And now another thing that it's not a bug but a bad choice of gameplay (for me). Fire don't hurt you. Not the fire spells, but the fire of bonfires and forges.
Look http://img.techpowerup.org/111117/TESV 2011-11-17 21-05-58-67.jpg .When you go into it, nothing happen http://img.techpowerup.org/111117/TESV 2011-11-17 21-06-03-79.jpg

Another debatable choice is that you can hit an enemy to the head with an arrow, but it don't die immediately....but ok, this is an rpg, and maybe this is normal, also if not so "realistic". If an rpg can be realistic...
Last thing I want to report, is the FPS drop when particles are on the screen. Tricks for lower it or completely remove, seems to don't work for someone like me. The problem is that particles seems to use CPU instead of VGA.
Is this the reason that causes the FPS drop. Generally, the game use too much the CPU and not enough the VGA.

Chapter 3: Useful and funny bugs. FPS Drop for new areas loading.
I found these videos on youtube, so them aren't mine.
http://www.youtube.com/watch?v=c-jUZjQJM0g Infinite Magicka bug. Seems to be a trick, but I hope can be fixed.
http://www.youtube.com/watch?v=o-hKxOhOQ3U The famous Giant bug. Usually, when a Giant hit a character, sends it in the sky!
Affect also our character, as you can see http://www.youtube.com/watch?v=Oso_mmhvm-Y&feature=related .
Now, another famous glitch. The Buckets glitch. As you can see http://www.youtube.com/watch?v=rt5aUdijAN8 , when you put a bucket on the head of an NPC, you can steal undisturbed. NPC never see that you steal. Can used also for kill undisturbed.
You can see http://www.youtube.com/watch?v=uBG-aYPNHFE&feature=related how to easily level up your character, also http://www.youtube.com/watch?v=AzmDa6ZEQf4&feature=related and http://www.youtube.com/watch?v=Yj8zoJhEb10&feature=related you can see how to raise your archery. But in the video you can see also notes on the screen for raise others abilities. Also M'aiq the Liar helps a lot for this. You can use he for raise attack abilities.
http://www.youtube.com/watch?v=SFVwuu9XxCc&feature=related another glitch for infinite Gold.
And http://www.youtube.com/watch?v=QyxzQez8FRM&feature=related there is a glitches mix.

I have always 58-60 fps when walk outside cities (in plains, woods, etc...), but suddenly fps drop down to 35-40. It seems to be that game have to load the new zone.
Maybe I can raise the Cell to load, but I don't know if my CPU works fine if I raise it, and anyway also if I raise the Cell...is always a Cell. I try to explian me better: I think that if I raise the cell, game drop down not every 6-7 seconds but after 13-14 seconds. It's the same thing or not? Longer time but always with drop down.
Is there a mode for make that game load "progressively" the new zone?

Chapter 4: The falling of Riften.
When you walk around the zone near Riften, there is simply a falling....an FPS falling. I think this problem is related to this:
"Generally, the game use too much the CPU and not enough the VGA".

Also inside Riften, there is an FPS Drop, but this happen in all cities.