Wired 13.10:: "I imagine swaggering up to a VeriChip scanner while proudly transmitting my own unique, outlaw serial number: 666 ought to do nicely" - a small post by Bruce Sterling.
Interesting concept, would you be able to hack the chips, just like many people use their xbox for a lot of 'tests'.
The trend of getting an implant as a "hip" way to stand out, was featured in an CSI Miami episode (info). Guess it could cause the same kind of trouble that was discussed in relation to US passports; if only rich/special/... people have them, then making a generic "sniffer" would be a great way for criminals (and so on) to easily find targets - and that would sort of defeat the purpose; convenience and flexibility.
Frogging
Last note from the October issue of Wired (13.10); a piece called Spam Vigilantes on a different approach to fighting spam - "active deterrence". The company offer the Blue Frog, and after giving spammers a chance to 'clean their lists', they start slowly pushing back. Taking it a step to far, or the only way to get them to do it right? Sad to say that I guess it might help a bit with the slightly legit spammers, but the majority of the junk will probably still keep coming. But, here's hoping...
