I got a couple of folks from work to come with me and got to the party around noon.
The turnout was surprising for apathetic Utah. I wish I could give a count, but I didn't have a decent vantage point to do so. I do know, however, that the crowd spilled out of the Federal Building's large front and took up the sidewalk. Easily into the hundreds, maybe a thousand (again, no way I can give a credible count).
Speakers included Event organizers ("regular Joes") as well as the AG and Rep. Chaffetz and Bishop. Everyone chanted "Send them home" when the Governor, Sen Bennett and Hatch were mentioned. Great signs and people were there. I must thank mnehrling for his great graphic (here) I used as my sign (got lots of compliments).
Lots of honks and waves, including all the trucker that went passed while I was there.
The turn out was great especially given the awful weather (mix of rain and snow with a temp around 35). Each time a speaker said they would shorten their speech due to the weather the crowd shouted "no!". It was nice seeing the passion by those involved.
We left around 1PM (yup, had to get back to work, so we can have our money taken to "spread the wealth around").
We had a blast!
Update: Local media reporting a thousand protesters. Woo hoo!