Where can I obtain Solaris 2/x86 maintenance updates?

Starting with Solaris 7,
Sun includes the drivers in the Maintenance Updates (MUs) and
updated versions of the OS.
These are available at

http://access1.Sun.COM/Products/solaris/mu/
(free access, but
you must register with "solregis"
or at http://SolDC.Sun.COM/
if you didn't during your Solaris install)