There aren't that many. Fundamentals are the same.
Backup and restore gained the CHECKSUM and CONTINUE_AFTER_ERROR options
On the restore side there's fast recovery (enterprise only), online restores (Enterprise only)
Can't think of any others offhand. Have a look through Books Online, specifically the "What's new in SQL 2005" All the details of all the changes are there.
Gail Shaw
Microsoft Certified Master: SQL Server, MVP, M.Sc (Comp Sci)
SQL In The Wild: Discussions on DB performance with occasional diversions into recoverability
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