J1.7 template update

What's different to J1.7 because I am modifing the version before the most recent and would like to update to J1.7???

Could you be more specific ? Joomla 1.7 features you can find here
http://www.joomla.org/announcements/rel ... eased.html

Are there a lot of changes in the recent version of the updated template is now postnote 1.8, but i'm working with postnote 1.7 which has been modified, i'm curious if there has changed a lot for use on J1.7?