The Directory of Open Access Journals currently lists 77 fully open access, peer-reviewed scholarly LIS journals. This list includes 2 titles with title changes, so the actual total is 75.
An Uhlrich's search for active, scholarly / academic refereed journals with "library" as a subject yields 246 titles.
This means that librarianship is already 30% of the way on the gold road, full open access publishing.
Analysis of recent journal start-ups is even more encouraging! For example, all of the journals listed in either DOAJ or Ulrich's with a start year of 2007 are open access. There are 9 journals in Uhlrich's with a start year of 2006, 8 in DOAJ (88%). There are more scholarly LIS journals with a start year of 2000 or later in DOAJ (39) than there are in Uhrich's (31)!
Full data are available in the open access spreadsheet LIS and the Gold Road.