Sehr gutes horizontales FlyOut

https://webdesignerhut.com/examples/pure-css-dropdown-menu/

http://htmldog.com/techniques/dropdowns/

Simple 1-Level

http://www.w3schools.com/css/css_dropdowns.asp

http://www.w3schools.com/css/tryit.asp?filename=trycss_dropdown_navbar

http://www.inmotionhosting.com/support/edu/website-design/using-css/simple-css-drop-down-menu

http://sperling.com/examples/menuh/

http://spyrestudios.com/38-open-source-css-dropdown-menus/

http://cssdeck.com/labs/pure-css3-smooth-drop-down-menu