Well, I received my Googlewave invite about an hour ago, stumbled around for 15 minutes, and then broke down and read some of the massive help material.
I gotta' tell ya', so far I like it. I conducted a quick search and found a group of 61 users in my local city, added them to my contacts, and had a great chat with Calvin D. Webster II of http://thinksea.info/blog/. Calvin is also coordinating Charleston's first BarCamp. http://www.barcampchs.org/ Cool guy.
I'll post screenshots tomorrow with some quick navigation tips. I will say for the record, it's easier to navigate and use than I first thought it would be.
Nice job Google. Now let's see what we can do with it. firstname.lastname@example.org