The development blog is here. It's full of announcements for Grocist and future plans.
Note: it's currently just the Grocist category of my Blended Technologies blog, but eventually Grocist will get it's own real development blog.
Where can I suggest features for Grocist and vote on them?
How do I add more than 1 of an item?
For now just scan it in multiple times but I'm working on a better method for doing this.