How to secure Internet Sharing?

Unless I've missed something, I can't seem to find how to securely share an internet connection in Leopard.
I can enable Airport, share the connection - but there doesn't seem to be any way to secure it - i.e. I want to catch the wireless connection, but I don't anyone else to.
Any ideas?

This is a big help Tim, thanks.
I was forewarned that Belkin Routers last about 3 minutes then expire - so I was not surprised when it slowly sank downhill. Our neighborhood does seem to have seen some new wireless faces appear over the last month or so and on the back of that I did systematically try running from channel 1 (on the Belkin) all the way up to 11 to see if it helped matters. It didn't, and it's at that point I thought the router was at fault. (Incidentally, I purchased a Belkin Ethernet Bridge and that worked perfectly).
So really, and on the back of the Airport Card being a bit un-secure - I think it's new router time.
Linksys WRT54g duly noted - I have recently set-up the Netgear WGT624 and this seemed excellent, and I also have experience of the 834 which has been consistently reliable.
There is another consideration though (are you still reading?) - brand new MacBook (latest spec.), this just crawls on its internet connection. After establishing the router was causing dropouts (i.e. with the Enet Bridge on my G5 nabbing wireless perfectly from an airport card via Internet Sharing) - I was able to see that the MacBook was extremely slow (side-by-side with the same internet pages on the G5).
Any thoughts on that one? (I'm trying to tie this all up in one question I know!).

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