GRC | ShieldsUP! — Internet Vulnerability Profiling  

Steve Gibson’s site has been around since the early days of the internet. It contains a very comprehensive description of what should be blocked as well as tools to probe to ensure stuff is blocked.

“A weekly Security Now! audio podcast has covered every security issue you might have. These mp3 audio files are freely downloadable, and since we have transcripts of every podcast, you can use our sitewide search to find any podcast by keyword.”