It hit me at work a few weeks back that I hadn't bought a new highlighter in years, so I pulled up my handy dandy JetPens link and this Pilot Spotliter Dual Tip caught my eye. I like the fact that the ink isn't too heavy on the paper, which is an annoyance to me. This highlighter is the perfect shade of blue for marking and for readability. The fine tip is a bonus for quick underlining or labeling pages. I wouldn't hesitate to purchase more colors of this pen.
By the way, the underlying pen is a Pentel Slicci 0.3mm - it looks great! :)
Also, let me apologize for the photo angle and cropping of the picture. I was taking the pictures and uploading them so fast I did a poor job. I guess that's what happens with a newborn in the house!