I have ubuntu 10 installed. I installed all the opencv packages I could find in the software center. I expect that it installs some .lib files somewhere that I can reference i
You can find the proper link flags using pkg-config --libs opencv and the proper includes using pkg-config --cflags opencv.
The actual libraries should be installed in /usr/lib and having names such as libhighgui.a or libhighgui.so, but you likely won't have to reference those directly. Just use the output of the above commands in the proper place in Eclipse for setting link flags and include directories. If you really do want to know which libs are OpenCV related, the output of pkg-config --libs opencv will give you the names. For example, one of the outputs of that command is -lhighgui, so we know there should be a file named libhighgui.so in /usr/lib.
I haven't used Eclipse in a while for C or C++, so I can't remember where those options are, but they are around somewhere.