I've downloaded and extracted the Oracle Open Office 3.3 Service Pack 1 (MacOSX, Multilanguage), Patch-ID 146564-01, several times from different machines (Mac OSX and Win7), but I only get the readme files. It seems there is no dmg packaged. The .zip-file is 41k only, instead of 21MB.
The correct file is now online. I think they (whomever that may be) realized shortly after the initial release that they had forgotten the dmg and built the proper zip on May 14 but forgot to link it properly.