Got a very nice letter back from the OED about their weblog-related entries. they are still going through the reviewing process, and it is their policy not to send out advance copies. However he could tell me a little more:
They’ve drafted “blog” (noun and verb), “blogger” and “blogging”, all recorded as in use from the summer of 1999. They also have “weblog”, dating back to 1993 (presumably in the logfile sense). The specific meaning of “a journal-like text held on a website” dates back to 1998.