In case you hadn’t heard, the Oregon Administrative Rules (OAR) Bulletin (the monthly updates to the OAR), will be online only, starting January 2010.
The multi-volume Oregon Administrative Rules (OAR) itself will still be available in print.
Law and government documents librarians have been active for many years (especially the AALL Government Affairs office) on this issue of authenticity of government documents.
See also: Uniform Law Commission: State Electronic Legal Materials
And: State-by-State Report on Authentication of Online Legal Resources