I'm using the Linksys WUSB300N USB Wi-Fi adapter under Windows Vista Home Premium x64. The problem is it doesn't wakeup when computer goes out of standby. It's really annoying.
I have 188.8.131.52 version of drivers dated 2007-09-11, and I think they are the newest ones.
In the network adapters/Wireless-N USB Network Adapter/Properties/Power Management I have "Allow the computer to turn off this device to save power" unchecked and "Allow this device to wake the computer" is inactive (disabled).
I have a couple of other USB devices and there is no problem with them after the computer wakes up.