I downloaded the Eclipse's C/C++ distribution and launched it on my Ubuntu Hardy system. Everything worked fine, I was also not surprised since I already used Eclipse on Ubuntu for developing Java apps.
The first step is to create a new project. Just start the Eclipse project wizard as usual and then select the "Hello World C++ Project" from the "Makefile project" category.
Pay attention to choose the Linux GCC compiler. I think you have to have g++ installed, so please check your system. When you press "Finish" Eclipse will create you the initial project structure. You should already be able to start it and get a nice message printed on the console:
It becomes however more complicated once you add new classes which get linked from your main class (which printed the "Hello World"). Assume you create a class "Hello" and reference it from within your main class as follows:
You'll most probably get an error message like "undefined reference to `Hello::Hello()'". The problem is that you make (created by Eclipse) needs to be updated s.t. also Hello.cpp and its header Hello.h are compiled correctly and linked to your main class. Now if you don't want to do that manually you can also let Eclipse do it for you by generating your make files. For doing so you have to right-click on your project, goto "Preferences" > "C/C++ Build" where you check the item "Generate Makefiles automatically".
Now it should work, and Eclipse generates automatically make files for new classes.
Developing using an IDE gives you so much more benefits as I believe. For instance creating a new class, Eclipse automatically splits it up in a header and implementation file. Furthermore it indicates you (with an appropriate icon) the position where a compiler error occured, helps finding the right/available methods with "intellisense" and much more.