Pro Feature Suggestion LIST
In no particular order:
1) User Online Status by Kiteman - allow pro users to see who's currently online
2) Auto Currency Convertor by Jayefuu - automatically convert currencies after users have set their currency of choice
3) Time Zones by Jayefuu - allow users to set their time zones in their profiles so ibles, forum topics and answers use times that actually mean something to them.
4) PM Subscribers - by Kiteman - allows Pro users to notify their subscribers when they publish a new ible.
5) Favourited by - by mikeasaurus - Pro members can see who's added their instructable to their favourites list.
Please post links to topics I've missed and I'll add them to the list above. I'm sure Eric and the team have their own list of suggestions we've made, but it'd be nice for us to keep track of what's what.