I hope this doesn't violate the low-quality rule. For those who don't know, when you right click an archive in Dolphin, the extract menu has a "Extract archive here, autodetect subfolder" option and its absolutely brilliant! If you've ever extracted a zip, tar, etc and ended up with files splattered everywhere this feature will prevent that. Basically when you choose this option it will:

• Look to see if the archive has a top level folder, if it does, it will extract it normally
• If it does not (so all of the files are at the top level), it will automatically create a folder for the archive and extract those top level files into it

It's something I really wish other file managers had, and is just another one of those features from the KDE team that gives me the "The developer(s) who created this also use this in their daily lives" impression (which is not to say that others don't). You can of course just open your favorite archive utility and manually check, then manually make the folder yourself and extract the files into there, but this lets me skip those couple of steps and I appreciate that so much.