The mushrooming home network market is now sprouting its own class of peripherals. The Linksys Network Optimizer claims to cure the hiccups and bandwidth-sharing problems that plague online gaming and VoIP connections. The OGV200 is about the size of a deck of cards and sits between the broadband modem and your router. There’s no manual setup, says Linksys. The device automatically distinguishes time-sensitive data streams such as digital phone calls and online game action and gives them top priority in the stream.