As a general matter, Slashdot's policy on linking to registration-required websites goes something like this:
The New York Times is okay, because they've got a lot of high-quality stories and they were essentially grandfathered in;
Other registration-required sites are not okay, and we won't post stories linking to them.
Kind of a shame, because the LA Times has some good content too, and we've posted lot of links to them in the past, before they went registration-required. Oh well.