It seems that, globally, HbA1c will be changing how it is reported: the current % units will change to mmol/mol. In the UK this will start in June 2009 with dual use of mmol/mol and %; In 2011 the use of % will be phased out. More information is available in these links.
i. http://www.acb.org.uk/docs/hba1clabprofessional.pdf
ii. http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=2282401

1. Updated: HbA1c graph report now supports mmol/mol units. If the reporting period inlcudes HbA1c values above 15.0 these are assumed to be mmol/mol and the graph switches to these units: any values found below this will be converted to mmol/mol, hovering the mouse over the graph will show the original value. If no values are above 15.0 the original % units are used.
2. Updated: The default HbA1c standardisation scheme for current % values is set to the US NGSP. Published research papers indicate two other standardisation schemes: Japan's JDS/JSCC; Sweden's. Support for converting to mmol/mol from these three schemes is included. To switch schemes one of the following commands must be run in the Terminal.app:
   1. defaults write com.Nesfield.DiabetesLogbookX HbA1cStandard NGSP
   2. defaults write com.Nesfield.DiabetesLogbookX HbA1cStandard JDS/JSCC
   3. defaults write com.Nesfield.DiabetesLogbookX HbA1cStandard Swedish
3. Updated: HbA1c fields no longer include number formating with %.
4. Fixed: Corrected a bug caused all imported events to be set to the current month.