Here are some online BDSM resources I appreciate:
Fetlife is the best social network for most types of kink. If you are interested in anything kinky and are not a member, you probably should become one. My username on there is CareandControl.
I wish this website was half as good as its material, or a quarter as amazing as its authors. Obsidian and namaste are ministers and therapists that have been in a committed M/s relationship since 2000 (collaring in 2003), raising 8 children, planning like corporations and loving like they just started the infatuation period. Whenever I go to a conference where Obsidian and namaste are speaking, I go to every course they teach. I have even happily cried at moments during their presentation due to their love, joy, candor, power and practicality. Their pre-2012 writings are available in the bottom right corner. They have released newer material under the website powerandsurrender.com, which was defunct when this page was created.
A weekly podcast from a married, playfully reflective DDbg couple. Sometimes they focus on particular activities; they usually focus on relationships and psychology.
A weekly podcast from a married M/s couple in an open polyamory relationship that discusses numerous and various kink topics. Somewhat informative and a great background noise.
A weekly guest-driven podcast for a wide berth of kink play and lifestyle topics. Very playful and conversational, often juvenile.