One thing that I have noted as I have begun to study and work in the field of canon law is that it is a discipline that is woefully under-represented on the internet. That is the main factor that pushed me to get set up here right away: I am no expert yet, years from being so, but the more (sound) canonical presence online the better, and I hope that I can find and join other canonists, experienced and novice alike, in expanding the use of technology in our chosen field.
In the meantime, there are certainly some canonical sites well worth noting. First in any list (in the North American context, at least) must be Dr. Edward Peters of Sacred Heart Seminary in Detroit: his site is an invaluable cornucopia of canonical information, and his blog, though sporadic, is always clear and unapologetic in addressing current events from the perspective of canon law.
Faculties of Canon Law