Comment 0 for bug 310031

If you install flashplugin-nonfree on a x64 system, it should automatically install the 64bit version of Flash 10, instead of the 32bit version+nspluginwrapper. On x86 systems, it should install the x86 version, as it currently does.

More information on flash 10 can be seen here: http://labs.adobe.com/technologies/flashplayer10/releasenotes_64bit.html
You can Download flash 10 x64 from this Adobe Page: http://labs.adobe.com/downloads/flashplayer10.html