The Presidential power to issue Executive Orders and Administrative Orders is an offspring of implied constitutional powers to "take care that the laws be faithfully executed." Executive Orders and Administrative Orders derive their legal authority either from existing statutes or from other constitutional authority given to the President. Executive Orders and Administrative Orders do not have to be approved by Congress to be effective.
Presidential Executive Orders, Proclamations and Administrative Orders are required to be published in the Federal Register as documents of general applicability and legal effect see 44 USCA §1505. The only exceptions are orders which deal with sensitive national security measures which appear by number only in the Federal Register. Exec. Or. 11030, 27 FR 5847, 3 CFR, 1959-1963 Comp., specifies the regulations for the preparation, presentation, filing and publication of these Presidential documents.
Executive Orders, Proclamations and Administrative Orders issued by a President during a particular year are compiled and published by number in the annual volume of Title 3 of the CFR.
White House Website Inlcudes executive orders; proclamations; memoranda; speeches and remarks; Presidents's weekly address and press briefings.
National Archives and Records Site - http://www.archives.gov/federal_register/presidential_documents/website_guide.html (This site includes Executive Orders Disposition Tables.)