To answer the question about USB over ethernet: there are three things i can think of:
1. Ethernet KVM (keyboard, video, mouse). These use IP, so it works from all over the internet. Typically used for remote server management and the like. VERY expensive (minimum $600 or so).
2. Cat 5 USB extender. These devices convert the USB plug to Cat 5 cable and back. They are not ethernet, and cannot be plugged into a network!! You must use a dedicated Cat 5 cable for them. Not too expensive, readily available for under $100. (There's a very cheap one on the link below, btw.)
3. Pure USB. USB's maximum cable lenth is 5m, about 16 feet. But here's the key: that's between hubs and devices. So if you use a powered hub, you can extend the distance by 5m. There exist active USB extenders that are basically one-port bus-powered USB hubs. They regenerate the signal and let you go 5m farther. Hubs or active extenders can be daisy-chained, up to 5 of them to get very long distances.
As for Bluetooth: standard Bluetooth is 30m in the clear. On my PowerBook's internal Bluetooth and my Sony Ericsson phone, it works more or less reliably in a 20ft radius through walls. With no walls in between, it's very reliable over longer distances. But you can also buy special ("Class 1") Bluetooth dongles that have more than 3 times the power, and go 100m in the clear. One of those would fill your AV room easily.
tooki
1. Ethernet KVM (keyboard, video, mouse). These use IP, so it works from all over the internet. Typically used for remote server management and the like. VERY expensive (minimum $600 or so).
2. Cat 5 USB extender. These devices convert the USB plug to Cat 5 cable and back. They are not ethernet, and cannot be plugged into a network!! You must use a dedicated Cat 5 cable for them. Not too expensive, readily available for under $100. (There's a very cheap one on the link below, btw.)
3. Pure USB. USB's maximum cable lenth is 5m, about 16 feet. But here's the key: that's between hubs and devices. So if you use a powered hub, you can extend the distance by 5m. There exist active USB extenders that are basically one-port bus-powered USB hubs. They regenerate the signal and let you go 5m farther. Hubs or active extenders can be daisy-chained, up to 5 of them to get very long distances.
As for Bluetooth: standard Bluetooth is 30m in the clear. On my PowerBook's internal Bluetooth and my Sony Ericsson phone, it works more or less reliably in a 20ft radius through walls. With no walls in between, it's very reliable over longer distances. But you can also buy special ("Class 1") Bluetooth dongles that have more than 3 times the power, and go 100m in the clear. One of those would fill your AV room easily.
tooki