This is a different issue from the journals of opinion that hide a lot of their content behind subscriber walls, which to my mind misses the point of having a journal of opinion. However, since these journals include The Weekly Standard, Commentary, and National Review, this may work out for the best. But the reason I'm mentioning this is that there's a service called Bugmenot.com, which "was created as a mechanism to quickly bypass the login of web sites that require compulsory registration and/or the collection of personal/demographic information (such as the New York Times)." It provides you with passwords for the "Registration Required" sites, but not the subscription sites, of course. There's a tutorial here, and their frequently asked questions are here.
So you don't have to register for any of these sites, if you don't want to.