There is the Android documentation:
And there is this WordPress blog I found:
Neither worked for me out of the box. But by piecing together bits and pieces from other sources, I think I have managed to configure Eclipse to run with the ADT plugin. I will post a step-by-step guide here with my source.
There is also this nicely detailed step-by-step guide for Ubuntu 10.10 listed in another question that deserves mention:
Again, I don't think the steps listed there will work for 11.10 64-bit, but it offers an excellent overview of the process in general.