Doing a mass find-and-replace operation on the Perch Blog app so I can have more than one running at the same time. If you want to do something similar, here are the strings you need to replace:
blog⇒yourNameBlog⇒YourNameperch_blog⇒yourPrefix_yourNamePerchBlog⇒YourName
And then obviously rename the .class.php files and activate as you would any other app.