Work with MongoDB in scala lift project using eclipse

Hi,

I want to work with MongoDB in my scala lift project.
I tried to use the casbah driver. Is there good documentation for it
as well as this one: http://api.mongodb.org/scala/casbah/2.1.0/index.html?
I saw there only simple examples.

Some questions I haven't found any answer:
How can I select with some conditions (with or\and)?
How can I create embed\ referenced fields?

All the examples I have found, are for the command line. How can I
implement them from my scala- lift project? Is there better or simpler
driver to use?

Thanks in advance
Rina