I probably should claim the main responsibility/blame or whatever for employing "dialog box" over "dialog" over at OOoAuthors since 2006. My basic rationale was that dialog box was more widely used by most of the major software/firmware/hardware developers over the past two decades, including Microsoft, Sun Microsystems--the previous sponsor of OOo, Motorola, Red Hat, IBM, among numerous others.
When working as a technical editor of user guides for (embedded-microcontroller) compilers, assemblers, IDEs, etc. over at the newly branded spinoff of Motorola--Freescale Semiconductor--during 2005, I was directed to follow its corporate style guide, which strictly mandated its use over dialog (no exceptions were allowed, as with many other corporate style guides, such as guides for those firms listed above).
Also, the Wilkipedia has dialog box in lieu of dialog (http://en.wikipedia.org/wiki/Dialog_box). The Wiki tends to employ the more accurate nomenclature for most GUI components. If one follows the Wiki forms, then agreement can be more universal. [Hint: If one does not like whatever form the Wiki employs--change (edit) it...] Some editors prefer dialog for one reason or another; others consider the use of dialog to be flawed, lazy, or sloppy usage. Oracle tends to employ both forms...
Another area of disagreement is in the use of "tabbed page" or "tabbed window" versus a "tab." A tab is the part of the GUI component on a tabbed window/page that a user selects for accessing the desired page/window, much like a small tab on an index card in an older paper-based filing system. The page/window itself contains the bulk of that document's information, but not the small projection (tab).
There are others.