Sarkastik's Blog: http://sarkastik40k.blogspot.ca/p/links.html
Here are some websites that I find to be very good sources of
information and help when it comes to painting technique and criticism.
Miniwargaming - www.miniwargmaing.com - a Canadian-based hub for war gaming information with an online store and forums.
Reddit - www.reddit.com/r/Warhammer/ - is a great community of about 9,000 people who share their painting/modeling/battle reports/fluff questions/list and gaming questions.