I also had an idea that I posted on a previous beta post, but there have been so many, I don't want it to get lost, because I think it's a good one:

It would be nice if any content could be placed into any groups of which you are a member. For example, if I create a blog post, I want to be able to place it into any of my groups. I'd also like to be able to place videos or any other content into any group (even more than one group) without having to go to the group and upload it there.