Since last week I have started an OS installation marathon. I am trying several operating systems on my disk or on Virtualbox. I will write in one of the next posts about the several experiences. Until now I have installed next to my primary Arch Linux installation: on Disk (extra partitions): Gentoo, OpenSuSE, Debian, Fedora, Mint; on Virtualbox: Haiku, OpenIndiana. Pending: Slackware.
--Edited with Vim through w3m on Gentoo.