I am going to *try* and post a weekly update on the Joomla 1.5 upgrade progress. Hopefully this will keep me motivated on the upgrade and let you know that things are happening.
So far the progress is going faster and is less painful that I had initially thought. I will not be using the same Model-View-Controller design as Joomla (Simple Review has it’s own MVC thing happening), so the main problem is that there are global mosXXXX variables (and some function calls) everywhere which are now no longer used in Joomla 1.5. To prevent this problem occurring again I have created a CMS bridge for Joomla 1.0 and 1.5. All non Simple Review code must go though this CMS bridge, this makes it a lot easier to support older and newer version of Joomla (and possibly another CMS e.g. WordPress).
Currently Simple Review installs natively on Joomla 1.5 and does some stuff, there is still a lot of work getting it up to date so stay tuned.