is the mother lode of magazine archives, with publishing information and cover art, including a prodigious pile of pulp magazines
Future Magazine covers:
A bit self-aggrandizing in a subtile way. However I found the future mag covers engaging enough in a "lite" sort of way. (click on: "See covers from the future" option)(via)
a few thousand science fiction covers
is a flash presentation of thousands of SF magazine covers from the fifties through today, arranged chronologically from left to right, and grouped by color from top to bottom.