HeinOnline keeps getting bigger and better. Take a look in the What's New in Hein-On-Line section under May 28, 2004: lots of new content added. For Canadian content, coverage of the Alberta Law Review has been expanded.
If you haven't used this service before, it has full-text searchable periodicals (especially legal periodicals) with PDF version available for those fresh-from-the-photocopier printouts. This has made a lot of materials available to us on a just-in-time basis, so we have found a subscription to be well worthwhile.