Note: I found this incomplete linkdump file in progress and decided to post it and backdate it just ‘cos.

Mathematics
The mathematical square knot doesn’t much look like a real square knot to me, but the granny knot looks much closer, so maybe I’m just not visualizing “right”.
http://en.wikipedia.org/wiki/Square_knot_(mathematics)
http://en.wikipedia.org/wiki/Granny_knot_(mathematics)

Events
Mandarin Morning appears to be a Chinese tutoring service geared towards business people in Shanghai. Part of their cultural education series is a lecture on Chinese knotting.
http://www.mandarinmorning.com/mandarin_morning_SpringCourse.html

The Office of Intercultural Relations at Old Dominion University in Norfolk, VA had an International Festival on March 28, 2010 which included Chinese knotting demonstrations among many other things.
http://www.huzhubbs.com/?p=2506

Pretty pictures
Pictures from the Dutch IGKT March 2010 meeting. Mostly pineapple knots.
http://home.tiscali.nl/knotsandknottying/igkt270310.html

An article about tattoos and Celtic knot symbolism that I skimmed most briefly, but then admired the pretty pictures. YMMV.
http://www.buzzle.com/articles/celtic-motherhood-knot-tattoo.html