As far as Huddle goes, I hope it's easy to go from a normal text straight into a Huddle. Also, typing status is very helpful in a chat room to avoid the inevitable conflicts that occur when people happen to type responses at the same time.
Sparks looks somewhat like Google News filtering. I'm not sure if I'll use it if that's all it ends up being.
Hangouts could be interesting, but because it's many-many communication like Huddle, the conversation flow could be difficult to maintain. I hope it works out.
Google seems to run into the large corporation octopus issue where knowing what the left and right hands are doing is a difficult task.
I noticed this too in the demo, I have to believe you'll be able to.
EDIT: Made it a little bit more clear
1. It looks CLEAN While in my opinion one major reason Facebook ended up beating out Myspace was its wonderful interface, I feel like recent renditions have just lost that simplicity. I want connecting with my friends to be simple, not a bombardment of Farmville updates and a poorly designed messaging system.
2. Sparks Hopefully Google will succeed where Facebook has failed in actually making keeping track of your interests, well...interesting.
3. Circles Friend management in Facebook has always been one of my biggest complaints, Circles seems to be a legitimate approach to making organizing your friends a little bit more intuitive.
I am very excited to see Google+ roll out to the masses, and I do hope it is successful. Not because I want it to take Facebook down, but I think it wouldn't hurt to make them break a little sweat and think about their users a bit more.