I do have some feedback on the 70-448 and 70-452 exams here

Quick Feedback on the 71-448 (70-448) Beta Exam ...

Quick Feedback on the 71-452 (70-452) Beta Exam ...

You can get practice exams for these tests at Transcender.com. Another exam that you might be interested in is the 78-702 and there is currently a free eLearning training that you can leverage for this:

Clinic 5046 - Clinic 5046: Inside Look at Building and Developing Solutions with Microsoft® Office SharePoint® Server 2007 (2 hours)

https://www.microsoftelearning.com/eLearning/courseDetail.aspx?courseId=61966&tab=details