FYI: It appears that Phorm (a targeted advertising system which taps into
ISP networks) will be setting its own persistent for most every
website the user visits. It appears as though the may be named
"webwise". One technical description of the system and this aspect can
be found via:

http://www.lightbluetouchpaper.org/2...ebwise-system/

or if you want to go straight to the report:

http://www.cl.cam.ac.uk/~rnc1/080404phorm.pdf

For those unfamiliar with Phorm:

http://news.google.com/news?hl=en&ne...h+News&q=Phorm
http://www.badphorm.co.uk

*sigh*