Where is USB -stick automounted in OSX? Not /media/usb/something like in Ubuntu
All volumes (CDs, USB, harddrives, etc) are mounted into /Volumes.

After inserting a USB stick called USB I see the following:

alex@smiley:/Volumes|⇒  ls -lrt
total 8
drwxrwxr-t  30 alex  staff  1088 Aug  4 14:34 USB
drwx------   1 root  wheel   568 Aug  4 23:59 Family Backup
drwxr-xr-x   6 root  wheel   340 Aug  5 00:00 Time Machine Backups
lrwxr-xr-x   1 root  admin     1 Nov 14 20:55 System -&gt; /
drwxr-xr-x  39 root  wheel  1394 Nov 14 20:57 SmileyBackup


In addition there you can see that my main drive is System. OS X creates a link to / for it automatically.

Also, Smiley Backup is another disk, and Time Machine Backups is a TimeMachine volume, and Family Backup is a remote shared drive I've mounted from another system.