Yes, the Linksys WMB54g works perfect; I have zone1 as local soundcard and zone2 as remote Linksys, I can control each zone with Netremote and play music without any problem.
PC sound and Audio device properties:
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Sound playback:
Default device: C-Media Wi-Sonic Wireless Audio
my MC11 setting are as follows;
Under Options menu ->
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Output mode: Direct Sound
Output mode setting:
Device: C-Media Wi-Sonic Wireless Audio
Channels: Default
Under Player --> Playback options ---> Zone Manager
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Zone1 is set as --> Output mode : Wave Out
Output mode setting : Device : Wave mapper(recommended)
Zone2 is set as -->Output mode : Direct sound
Output mode setting: Device: C-Media Wi-Sonic Wireless Audio
Channels: Default
Only problem is that Linksys allows just one client ( I haven't tried more than two clients) so I need to find another two clients that will allow me to add 2 zones and give me music control via Netremote.
hope this helps.