Thanks for your reply, unfortunately I don't require Glassfish itself but the webstack that included updated versions of MySQL, Apache and PHP (these are the bits I use anyway). Solaris 10 doesn't use the IPS system, so I can't install those components that way.
I may just have to use the sunfreeware versions of those applications or compile them from source, I just like the convenient and optimised versions of those appliations that Sun built.
To the best I can tell, Webstack on Sol 10 is dead. If you have an existing support contract, it will remain in place until 2014. No new support contracts will be sold. There is no indication from Oracle as to whether a transitional path to another product will appear, or whether they care about the SAMP market at all anyway.
Webstack on OpenSolaris continues, and still seems in active development. However, with OpenSolaris 2010.03 MIA I have no idea what is going on there.