Ever since I've added the Google+ comment system to my blog, I've been enjoying conversations on Google+ a lot more. Those same conversations always seemed more "forced" before. If you do any sort of marketing on the internet Google+ is a must and isn't really optional anymore.
Also, I just noticed you mention Mike Arensen's tool. I made a WordPress plugin based on his tool: http://blog.paulnshapiro.com/new-google-plus-interactive/
I apologize for linking to my own content, but I got excited :)
@pshapiro Thanks, Paul. Look forward to checking it out. I'm sure many readers will be happy to see there's a Plugin :-)