[via Jamie Thomson]
http://download.microsoft.com/download/4/f/8/4f8f2dc9-a9a7-4b68-98cb-163482c95e0b/SSASProperties.doc#_Toc136412586
As Jamie points out, what would be really nice now is a white paper on performance tuning and how best to tune these settings. Mosha discussed a white paper some time ago, that he was working on regarding AS caching, but I don't know if that touch on server settings. It looked more like it would help in understanding some of the volumes of information that can be gathered using the SQL Profiler.