i was having permission troubles moving files between my 3.0 install and my cooking install.
i think that the output of following comands can show the reason why:

root@cooking:~# cat /etc/group
root:x:0:
lp:x:10:
audio:x:20:fabio
nogroup:x:99:
www:x:80:
messagebus:x:25:
cdrom:x:1000:
dialout:x:1001:
disk:x:1002:
floppy:x:1003:
kmem:x:1004:
tape:x:1005:
tty:x:1006:
video:x:1007:
haldaemon:x:26:
fabio:x:1008:
root@cooking:~# cat /etc/passwd
root:x:0:0:Root Administrator:/root:/bin/sh
nobody:x:99:99:Unprivileged User:/dev/null:/bin/false
www:x:80:80:Web Server User:/var/www:/bin/false
messagebus:x:25:25:DBUS Daemon User:/dev/null:/bin/false
haldaemon:x:26:26:HAL Daemon User:/dev/null:/bin/false
fabio:x:1008:1008:Linux User,,,:/home/fabio:/bin/sh

it seems that some groups get gid higher than 1000, so my only user fabio get id 1008 instead of the more reasonable 1000, which usually is the default for the first unprivileged user in a linux system.
would it be possible to correct this?