Sometimes there is a number in an orange box to the left of the "review" button at the top of the page. Clicking on the number brings me to the review queue, just like clicking the review button itself. But what does this number (or lack thereof) mean?
Intuitively, I would think this would be the number of posts awaiting review. But this number and the number of posts in the review queue are rarely equal. Furthermore, sometimes there is no number there and there are posts in the queue or vice-versa.