You can use this script to check if any procs will break under compatibility level 90.
2012-03-08 (first published: 2008-01-29)
Find and Replace a string in all string fields (char, varchar, etc) of all tables in the database.
2011-10-27 (first published: 2008-02-08)
Use this proc if you need to alter a column that is part of a primery key
2008-02-04 (first published: 2007-12-10)