things to look out for ArcGIS 10

1. edit using map templates -
feature templates define the geometry, attribution and symbology. its also useful to use the new construction tool ... and editing 'tooltip' during mapping.
2. borrow licenses - you can check out licenses and take your GIS work home. this is definitely useful for some of us ... we tend to work better late nights at home with lotsa coffee. in the era of flexi working hours ... this license is long overdue ... I also think its more productive to work when you are in the 'zone' :-)
3. ArcPy - I don't think its fully complete yet ... but the latest Python package includes a mapping module that interacts with map documents. creating map series from indexes will help bulk map production workflows for sure