Besides some bonehead typos that wasted a lot of time, here are the summary of issues I've run across:
- Creation of the new admin.py
- Modifications of urls.py
- Conversion between max_length and maxlength in your modles
The main problems related to the admin interface, but there are a number of resources I've run across including Porting your apps from Django 0.96 to 1.0 and the complete list of backward incompatible changes and a conversion script to create the new admin interface conversion.