1.5.10: spdy not being used at all here

after reading about 1.5.10 release.. i discovered SPDY.. i had not heard of it before.
so i built nginx with the spdy module and restarted the server.
i added spdy to the name of the server in the server config - next to ssl and default_server.
(my site is ssl only).

i thought that would be all i needed to do to activate spdy.
however, when i view my site using the firefox spdy test plugin (or using the spdycheck website) - they both show spdy is inactive.

anyone know why that would be?
thanks