There are not that many resources online on CORBA and components... However, here is a list of sites which may be of some use to you.
GNOME development: this is the official GNOME developer page. It contains many documentations (including this one), tutorials and the latest news on the front of GNOME technologies.
ORBit : ORBit is the CORBA 2.2 ORB used in GNOME. Its homepage contains an interesting tutorial on CORBA and some links to various other CORBA resources.
The OMG : the Object Management Group is the organism which is responsible for the evolution of the CORBA standard. All the CORBA reference papers are available there. A must !
Microsoft : they invented OLE. THE reference book on OLE 2 (Inside OLE) is available online for free on their developer site.