It would be nice to have a feature that allows you to post to multiple communities simultaneously (if those communities allow it, of course). Similar to the way we use multiple tags. Cross posting sounds like more work, so if I could just tick a box, then that would be nice. A limit could be placed, so you have to choose which communities are most relevant to your post.

Browsing the content with tags should also be re-introduced perhaps. Then you have the choice of easily browsing by community or tags.