Linux - What do the common root folder names mean?

Possible Duplicate:
Meaning of directories on Unix and Unix like systems

I am rather new to linux, but I have installed a few different flavors. I noticed they all have similar folder names in the root directory

bin
boot
dev
etc
home
lib
lost+found
media
mnt
opt
proc
root
sbin
selinux
srv
sys
tmp
usr
var

I googled around, but couldn't find anywhere that explained the purpose of each of these. I understand a couple, but could anyone point me somewhere or give a quick breakdown of the common ones.

From serverfault Josh

• Most of these directories are described in the: Linux Filesystem Hierarchy

  From basvdlei

• This is well defined by the File System Hierarchy Standard (FHS).

  Wikipedia Link
  FHS Website

  From Zypher

• The Filesystem Hierarchy Standard details most of this quite well. Please note that not all distros adhere to this standard.

  From jscott