This is my current wireless router. Not because I love all things Linksys, because really I don't, but because this is a neat little 125 MHz MIPS box running Linux. And because of an oversight by Linksys in the Ping tool on their Admin page it is easily hacked. You can do things like running Snort directly on it and have your gateway email you or notify you via irc/IM/pager if someone is trying to sniff your network. You can of course also run fancy netfilter/iptables rules or anything else you can typically do on a Linux box when you have it acting as your gateway. See the SeattleWireless page on the wrt54g for all the details.