With every version of SQL Server come warnings about features/code that is deprecated. You can use the sys.dm_os_performance_counters dynamic management view to find what these deprecated features are.
If you run the following query on SQL Server Denali CTP 1
select * from sys.dm_os_performance_counters
where object_name like '%deprecated%'
You get back 239 rows, below are the new things compared to 2008
sp_configure ‘awe enabled’
sp_configure ‘affinity64 mask’
sp_configure ‘affinity mask’
SET ERRLVL
SET FMTONLY ON
sp_dropsrvrolemember
sp_addsrvrolemember
sp_droprolemember
sp_addrolemember
sp_changedbowner
DBCC_IND
DBCC_EXTENTINFO
Old NEAR Syntax
NOLOCK or READUNCOMMITTED in UPDATE or DELETE
Take a look at this post Find Out If You Are Using Deprecated Features In SQL Server 2008 if you want the list for SQL Server 2008
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