Hotspot 802.11b/g Connection Sharing Router?

* Is there anything out there being used as a connection sharing router such
as used for Cable or DSL, but used to share a WiFi 802.11b/g connection? It
would have to have 802.11 client capability on the outside (WAN) to the
Hotspot, but would do NAT an allow an inside computer to sign on, and then
share the connection.

If there isn't anything in one box, how about two boxes?

I already know this can be done with ICS in Windows and also by Linux and
other Unix systems, but looking for something in one box with no moving
parts to break down.

--
Alan Spicer
Systems, Networks, Telecommunications