Ok, I'm helping my dad set up a small internet cafe with 3 PCs, basic web browsing, email, and document editing mostly, and I've decided on Linux so there's no worry about viruses/malware getting onto the machines, or software license costs
What I'm more interested in is ideas of things for the computers in terms of stuff provided and lockdown/security - some of the ideas I have are:
- almost certainly Gentoo, if only because I'm more familiar with it than Ubuntu, and for the customisation aspects of it. I'll probably clone the disk from one machine once ready onto the rest or something to avoid multiple compilation/reconfiguration.
- Firefox/Thunderbird/OpenOffice, maybe Gaim and some IRC software too, and any small games bundled with KDE/Gnome or whatever
- need to think about flash/pdf support
- MacOS-like docking bar at the bottom to put the browser/email/IM/Office stuff on, and with simple names
- Compiz-fusion for other useful eyecandy but not the distracting stuff, if the hardware supports
- iptables to block outbound port 25
- OpenDNS to block dodgy sites
- some way to reset user settings to a known state. Not decided on whether to use a chroot, some way to copy partitions/directory trees over on bootup and wipe temp folders, or a mixture or anything else.
- dunno whether to have a separate box running squid to proxy web traffic through, so can do Adblock-type filtering as well like I do on my home network already, without needing local plugins which users can disable. If we go with this separate box, then diskless machines/netboot might be an idea too, but that's not something I've toyed with much before on linux

I guess it could also serve as a remote admin point or even a full firewall and NAT all traffic through it.
Anything else or ideas on implementation would be nice