Despite its isolated nature, Yellowknife has a well-developed telecommunications infrastructure. High speed internet and wifi is plentiful. If your hotel/B&B does not offer free wifi you can also obtain this legitimately from a number of spots throughout the city.

Javaroma  (Downtown - Northwest Building - 5201 50 Ave)
Yellowknife Airport
Yellowknife Public Library (2nd floor of the Centre Square Mall - 5022 - 49th Street)

Bayside B&B - 3505 McDonald Drive, Yellowknife, NT

Listing is up to date as of November 2011