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I'm looking for a method that can be integrated into the existing functionality of the laptop or installed without affecting its form-factor too much. It would be nice if I could integrate this solution with my desktop at work, too.
The ibutton is promising, but I'm unsure if/how I could integrate a reader into the machine. I'm quite handy with disassembly and micro-soldering, however, so working for it isn't an issue, and I'm definitely willing to void warranty, since I'm probably buying it used.
RFID is interesting, but the only PCMCIA/CF/Cardbus readers I've found that don't have bulky antennae are upwards of 500 USD.
Blueproximity is an excellent idea, but I'd like to find a method I could use that didn't involve turning on the battery-eating bluetooth feature on my phone. Are there simple bluetooth keyfobs out there?"