It's about time they did this. Harvard's was about the only major library that didn't allow Z39.50 access to their full MARC21 records. As a private individual with a large rare and antiquarian book collection, I welcome the news, since I've found that Harvard sometimes has the only other copy of a book I'm cataloging. A few other libraries require you to jump through some hoops to get to the data (British National Library, for example), but Harvard was shutting everyone other than faculty and alumni out.