Skim (Mac only) is a PDF reader and note-taker for Mac OS X. In my view it is much better than Adobe Reader and easier to use. You can highlight text, add and edit notes, create bookmarks, and read your documents in full-screen mode. Best of all: it’s free!
Disclosure of Material Connection: Some of the links in the post above are “affiliate links.” This means if you click on the link and purchase the item, I will receive an affiliate commission. Regardless, I only recommend products or services I use personally and believe will add value to my readers. I am disclosing this in accordance with the Federal Trade Commission’s 16 CFR, Part 255: “Guides Concerning the Use of Endorsements and Testimonials in Advertising.”