Here is a topic I started to collect the many bugs of Skyrim in the hope Bethesda Game Studios will ever fix them, for a modern 3D engine:
http://www.gamesas.com/index.php?/topic/1260947-serious-bug-reporting-collision-sound-underwater/page__gopid__19345309#entry19345309

Please, if you want to contribute... but let's keep the thread clean of comments, flames, likes and dislikes. Just for bug reporting purpose...

I caught three butterflies! Kind of funny how they just sit there and let you do it.

Er, sorry. Was pretty impressed by this game on the bug front for a while, seem to have been able to fix the random CTD issue by making the exe large address aware. But then the main quest broke - I hadn't completed the "join the stormcloaks" quest before starting the Season Unending quest, so now Ulfric won't give me the proper dialog. Apparently you can fix that by failing the joining quest via console, but it sounded like there might be some issues with that, so I'm just starting up a new character until it (hopefully) gets fixed in the next patch. I'm sure this bug's already been collected though.