Very similar thread and unfortunatelly that thread last message similar like in this thread:

Thanks Deepak. But it doesn't list any new Sql 2005 features.(Like CTE, CLR Integration and Try.....

Unfortunatelly document in this link describes which old fashion features won't work under 90 or will work by another manner, but there are no any info about new features which is...

Maybe exists any list of features which can't to be used in dbcmptlevel=80 ?

The only drawback i noticed that for DB in dbcmptlevel=80 Object Managment Studio doesn't show performance reports(Perf...