These are the first two of four Sharepoint exams.  I’ll be taking the other two next week (70-541 and 70-542).  These two are focused on the installation and configuration of both WSS 3.0 and MOSS 2007.  I was actually surprised at how much I knew before I even started studying.  I’d say if you work with Sharepoint in some form on a regular basis, you probably just need to brush up on some of the more esoteric things.  Network Load Balancing was something I don’t use in my day-to-day with Sharepoint, so I read up on it a bit.  If you are looking to take these tests, just follow the outline on the Microsoft Learning site.