>I'm looking at taking the exams.
>What can anyone tell me about them?

We can't reveal the contents of the exam to you, but here are some resources for you. You'll need to cut and past these URLs into your browser. 70-156 is the desktop VFP exam, and 70-155 is the distributed VFP exam.

Exam Outlines
http://www.microsoft.com/trainingandservices/exams/examasearch.asp?ExamNumber=70-155&ExamTitle=Designing+and+Implementing+Distributed+Applications+with+Microsoft%AE+Visual+FoxPro%AE+6%2E0&PageURL=/TrainingAndServices/content/exams/70-155.txt

http://www.microsoft.com/trainingandservices/exams/examasearch.asp?ExamNumber=70-156&ExamTitle=Designing+and+Implementing+Desktop+Applications+with+Microsoft%AE+Visual+FoxPro%AE+6%2E0&PageURL=/TrainingAndServices/content/exams/70-156.txt

In the winter of 1999 a bunch of us held thrice-weekly chat sessions while we studied for the beta versions of the VFP exams.
http://fox.wikis.com/wc.dll?Wiki~CategoryExam70-156
http://fox.wikis.com/wc.dll?Wiki~CategoryExam70-155

Cindy and I wrote an exam study book, and you can get some sample chapters:
http://www.hentzenwerke.com/catalogavailability/certfox6.htm
http://www.hentzenwerke.com/samplechapters/zsamplechapters.htm