A $250 NIC targeted at gamers, which apparently really does cut Ethernet latency by completely offloading the network stack off the host CPU.
Actually, it is a full blown Linux machine you can log in to and stuff; it is really a 400 Mhz PowerPC with 64 MB RAM, 16 MB Flash and ability to use external USB storage. So, this computer-inside-computer is quite useful even without performance benefit. You could offload your torrents, firewall and other network-clogging shit there...