Any page highlighted in yellow at Special:Newpages has not yet been marked as patrolled. This means that it may not have been reviewed. When you check the page, you should mark it as patrolled if (a) you see that it is a good page or (b) after you tag it for deletion. If you are not sure about what to do with a page, do not mark it as patrolled; another editor will review it later.

A new feature was turned on at enwiki a couple of days ago, patrolled pages.

Log files are here.

This will become an invaluable tool for skilled vandals as well.