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So when I read papers in hard copy, I like to be able to mark the line that I am reading currently using a notecard, which covers up things below the line that I am reading. This keeps me from being distracted. Is there a PDF reader that has a feature like this? I realize that most of the time I could just use the bottom of the screen, but I was just wondering if there is a purpose built tool for this. I use Mac OS X, by the way.

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Dupe. Please don't. – user31752 Sep 17 '10 at 17:45
Sorry. I'm really only duping because Apple SE is still in beta and doesn't get as much traffic as SuperUser – David Hollman Sep 17 '10 at 18:55
Then keep the one here and delete the one there. This is a software question so Super User is a better fit anyway. – Sasha Chedygov Sep 17 '10 at 23:13
Disable auto-resize of the PDF document and resize the window. Easier than the bottom of the screen and precision scrolling, dragging the window edge = moving the card. – Daniel Beck Sep 19 '10 at 18:01
up vote 1 down vote accepted

Skim is a free app that should be able to help you with this:

Skim is a PDF reader and note-taker for OS X. It is designed to help you read and annotate scientific papers in PDF, but is also great for viewing any PDF file.

It has a Reading Bar feature that can either highlight one line with a colour of your choice, or highlight all lines but one. You can move the Reading Bar around with your mouse. I hope this helps!

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