I'm switching over from Do.com. Producteev is very similar. However, there is one feature I believe is critical, and easy to add. I need the ability to create sections for each project to help organize my tasks. For example: Marketing (Section) Create logo (task). I know we can create tags, but that is not the same. I think we need the ability to move our tasks to various sections, just like on Do.com.
I think there are a couple ways you could set this up.
There's networks - So, you could create a network for your group, or a network for specific sub-sections of your team: Marketing, Finance, etc.
Or you could use tags - as a way to categorize tasks that live in a single project, but, include a couple different groups - ie, rolling out a new website would have tasks for Finance, Marketing, and Others.
Happy it discuss it through, with you.