Flock is really just a cutdown Firefox at the moment. It runs fast (presumably from being cutdown) but the extra features it claims to make it different aren't really that useful : since I don't use del.icio.us, flikr or a blogging service, integration of these gives me nothing. (Indeed, many people are saying the firefox plugins for these systems work better) I certainly can't see any magic Web 2.0 fairydust sprinkled round it anywhere.