All they are is very small-format motherboards, most of which have an embedded CPU, some of which dont. No socket 939 offerings though
Tons of onboard stuff on each one, some are fanless too which is nice
Look here:
http://linitx.com/index.php?cPath=12_74Id ignore the nano-itx boards for the moment - they are properly tiny but are a very new form-factor.
Then look at cases, Id suggest:
http://linitx.com/product_info.php?cPath=8_68&products_id=250Smaller, still cheapish:
http://linitx.com/product_info.php?cPath=8_68&products_id=291Dead sexy, expensive:
http://linitx.com/product_info.php?cPath=8_68&products_id=263And see whatll fit in, i.e. 3.5" hard drive, slimline optical drive, comes with a PSU, etc...
Optical drives:
http://linitx.com/index.php?cPath=59Not too hard
Wish I had the money to spend on one - owned one for a little while but needed the money so had to sell it