Help with web template design

ok a couple of questions about web template design
1 > Do I need to make an admin editing mode or is an XML config file usually enough(the client would just manually edit XML?

2> Does anyone have a sample config xml file i could look at to see what kindo of layout is good for a client?(or if its easier i could post my XML so far…but i think its starting to get bogged down… and be less readable… maybe different eyes could tell me if its convoluted and how to fix it)

[edit] Im making the template in flash…that reads an XML file