[LinuxBender]

Folks should also periodically get fingerprints of sites they often use and keep logs of them, so that you might notice if something changes.

example:

    openssl s_client -servername www.paypal.com -connect www.paypal.com:443 < /dev/null 2>/dev/null | openssl x509 -fingerprint -noout -in /dev/stdin                                                 
    SHA1 Fingerprint=E8:20:7A:27:8C:BE:D4:D9:7F:44:32:89:E7:6B:13:DD:CE:58:50:F6

Perhaps put all the sites you visit into a text file and loop through them into a date based file or append with date stamps. If enough people did this, you could probably even spot when an entire region is doing something shady or a company was potentially compromised.

[JoshTriplett]

Also see https://www.eff.org/observatory and https://www.grc.com/fingerprints.htm