I would favor using the more focused "sys" views - sys.procedures instead of sys.objects. You'll need to join it with the sys.schemas view to get schema name and such.
select
p.name,
s.name 'Schema',
p.type_desc, p.create_date, p.modify_date
from
sys.procedures p
inner join
sys.schemas s ON p.schema_id = s.schema_id
I would start to get away from using "sysobjects" since Microsoft clearly states in Books Online that "sysobjects" is subject to removal in a future release:
This SQL Server 2000 system table is included as a view for backward compatibility. We recommend that you use the current SQL Server system views instead. To find the equivalent system view or views, see Mapping SQL Server 2000 System Tables to SQL Server 2005 System Views. This feature will be removed in a future version of Microsoft SQL Server. Avoid using this feature in new development work, and plan to modify applications that currently use this feature.
Marc