Tracking Data - Who Owns It

March 26th & 27th: someone from Google visits my blog twice, once after searching for 'QR Codes', and another time for "Onestat.com query 2,3".

March 26th: someone from Towerstream ends up on my blog after searching for "SEO SEM cannibalization".

March 26th: someone from Walgreens gets to my blog after searching for "keyword level tracking codes".

I own this data, but is it unlawful for me to take advantage of IP address knowledge to expose to the public what companies visit my blog? It's only a matter of time before web analytics will let us know who the individual visitor is, at which point things get verrrrry thorny.