I have not visited LttD in a while... and responding to a post I realized I did not know how to approach this:

a) Discussing how to protect yourself, I wanted to provide a link to a cool site offering various products. Is this OK? I vaguely remember that 'advertising' other commercial sites was not polite.

b) I wanted to point out what others could do to an unsuspecting person, by linking to a site that describes hacking your RFID enabled credit cards from a distance, however I seem to remember that linking to sites that describe potential illegal activity was also not OK (the site described how he did it, but also provided schematics for the gizmo).. I did not provide the link.

What are the current policies on the above two points?