Adobe Flash Player 10.1 RC is now available as a prerelease. This version does not require the medialib dependency and should work on its own after installation. You can find it at the Adobe Labs site.

x86

$ wget http://download.macromedia.com/pub/labs/
flashplayer10/flashplayer10_1_rc1_solaris_x86_0
61010.tar.bz2
$ bzip2 -d flashplayer10_1_rc1_solaris_x86_061010.tar.bz2
$ tar xvf flashplayer10_1_rc1_solaris_x86_061010.tar
$ mkdir -p ~/.mozilla/plugins/
$ mv flash_player_solaris_10_1_53_64_x86/libflashplayer.so 
~/.mozilla/plugins/
  OR
$ pfexec mv flash_player_solaris_10_1_53_64_x86/
libflashplayer.so /usr/lib/firefox/plugins/

SPARC

$ wget http://download.macromedia.com/pub/labs/
flashplayer10/flashplayer10_1_rc1_solaris_sparc_
061010.tar.bz2
Follow x86 directions above