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The following page has been changed by YonikSeeley:
http://wiki.apache.org/solr/SimpleFacetParameters

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  The {{{enum}}} method was the default (and only) method for faceting 
multi-valued fields prior to Solr1.4.  It enumerates all terms in a field, 
calculating the set intersection of documents that match the term with 
documents that match the query.
  
- The {{{fc}}} method is the default in Solr1.4 since it tends to use less 
memory and is faster when a multi-valued field has many unique terms in the 
index.  The field is un-inverted and cached, much like the Lucene !FieldCache 
used to sort query results.  The facet counts are calculated by iterating over 
documents that match the query and summing the terms that appear in each 
document.
+ The {{{fc}}} method (stands for field cache) is the default method for single 
valued fields, and in Solr1.4 it's also the default for multi-valued fields 
since it tends to use less memory and is faster when a multi-valued field has 
many unique terms in the index. The facet counts are calculated by iterating 
over documents that match the query and summing the terms that appear in each 
document.
  
  The default value is {{{fc}}}
  

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