Navigation between communities is woefully bad at the moment. Way too many clicks to get from Point A to Point B, or to know what community you are in. I am feeling quite lost navigating the forum.
Taking from the good things in Yammer and potentially minimizing negative feedback. If you look at the left nav of Yammer, this is a great navigation strategy for how 10,000's of users have interacted with communities.
Following requests (for authenticated users):
a sticky menu of favorited/joined communities that is visible on the page at all times
- this could be tucked into the hamburger menu maybe, but there has to be a better way that navigating to 3ish pages to drill down to a particular community
a highlighted color of some sort that shows you what community you are currently viewing
- show the unread/new message numbers you currently are in the rounded boxes