Bluetooth has wireless infrared beat on this one. BT you can expect 30 feet distance from the EEE. Wireless IR you can expect from 4 to 6 feet.
Easy to setup and configure
USB wireless infrared has BT beat on this one. You plug it in and it just works. With BT, you have to use the command line to set things up, and you have to script it or else every time you boot you'll have to give it all the commands. Also, not all BT devices work. I have a Logitech MX 5000 combo BT keyboard and mouse. The BT device that came with it is not recognized on the EEE. There are plenty that do work, but it'll be an extra fee to get the hardware for it.
The BT wins this one. The wireless keyboard and mouse use a USB port and do not give you anything else. The BT adapter uses the same port, but also lets you connect BT stereo headphones, your mobile phone, etc.
It really depends on what your needs are. If your living room is 12 feet and you want to hook your EEE up to your PC and surf from your lazyboy at the other end of the room, infrared won't do it. If you want the keyboard in front of the standard EEE screen and just want a better one, then the wireless IR is fine."