Truncating all tables in a database with sp_msforeachtable

I recently wrote an application that retrieves a list of all computers for a specific domain from Active Directory and proceeds to query each computer for specific info. like Make, Model, Serial Number, OS, Service Packs, Service Tags, RAM, Processor info, Installed Applications etc.
Basically it just automates the process of keeping an up to date inventory of all the computers in my domain and stores the results in a SQL Server 2005 DB.
During the development and testing phase I wound up populating the database with loads of worthless data. after each execution of the partially completed app I wanted to be able to simply Truncate each user table in the user database.
Using the sp_msforeachtable undocumented stored procedure is as simple as this:

use MyDB
exec sp_msforeachtable 'truncate table ?'
If I only want to truncate the tables that belong to a specific schema I could run the following.

Use MyDB
Exec sp_msforeachtable @command1 = '
if (Select Object_Schema_name(object_id(''?''))) = ''dbo''
Begin
TRUNCATE TABLE ?
print ''truncated '' + ''?''
End
'