Harlan W S
I first saw this peak from Sentinel in 2005; Pierre was with me, and immediately wanted to try the peak. Within a few months we went with Nick up a Class 2+ route. The peak looks dramatic, but actually has a variety of fairly safe routes; the biggest danger in rockfall, and is worst on the class 2 approach.
The naming of the peak is interesting; Ed Forkos originally called it Booth Pinnacle, after Howard Booth, a pioneer in the exploration of Lake Mead peaks. However, I heard that Howard didn't want any peaks named after him, so the name quietly became "Pinnacle." Link to trip report for Pinnacle