Dmitry Kirsanov is finishing up the Nabokv-L Archive's interface on this web site, with powerful searching and sorting tools.
Update: The complete archive, 27580 messages from 1993 up until Nov 2017, is now available on this site. You can browse by years, as well as by authors (by clicking on an author name in a message). All messages are also searchable by the site's search (top right on any page). All message attachments are preserved and linked at the bottom of the corresponding message pages.