Best Freeware Packet Sniffer/Analyzer

Im currently running Ethereal on my Win2k machine. I like it and it is great. Just wondering if there were any others I should check out?

(Also looking for a LAN monitoring/Analyzing tool (robust, comprehensive, and FREE!! :D )

Thanks

Ettercap (runs on *nix although I think some students I've had, have gotten it to work under Windows)

Windump (Personally I prefer tcpdump on *nix but given this is for Windows).

I will try these....

Thanks