Here are some great places to learn more about grinding and biohacking.
These forums are full of super knowledgeable people, with an especially strong contingent of magnet implanters. If you want a sounding board for ideas or procedures, this is the place to do it.
This blog is run by Cassox, whom you can find in the Biohack.me forums, and is a great read. His three part series on magnetic implantation also heavily informed my plan for the procedure (part 1, part 2, part 3).
An awesome biohacking duo with an especially interesting project called Bottlenose, an ultrasonic range-finding apparatus that communicates data via induction to an implanted magnet.
The leading publication of the transhumanist movement, this site is an awesome resource for news, opinion, philosophy.
A great article on the duo behind Grindhouse Wetware and a well written introduction to grinding.