The answer doesn't seem to be 100 percent accurate. If you look up BOL ms-help://MS.SQLCC.v9/MS.SQLSVR.v9.en/tsqlref9/html/016fb05e-a702-484b-bd2a-a6eabd0d76fd.htm under SNAPSHOT ISOLATION it reads:
Except when a database is being recovered, SNAPSHOT transactions do not request locks when reading data.
and a litle further down
During the roll-back phase of a database recovery, SNAPSHOT transactions will request a lock if an attempt is made to read data that is locked by another transaction that is being rolled back. The SNAPSHOT transaction is blocked until that transaction has been rolled back. The lock is released immediately after it has been granted.
Am I missing something (again)?