Known Issues to note before planning to migrate/upgrade to SQL 2005 64-bit on Windows 2003 64-bit server (EM64 or x64, IA64)

This post is now migrated to a below Link. Please update your bookmarks incase you are accessing this page from your bookmarks.
New link has updated document with more precise known issues.
Please click on link below to access the new document.
http://www.sqlserverdba.co.cc/2009/03/sql-server-32bit-to-64-bit-migration.html

Thanks!