I use Skim for reading PDFs whenever I don’t need to do major collaboration with others with Acrobat. I really like it and recommend it whenever someone even remotely mentions issues with reading PDFs on OS X. One neat thing Skim has is a reading bar. It helps to focus when going through code related books, etc. I never knew how to make the most of it until today. I was thinking “it sure would be nice if you could move that reading bar with the keyboard.” I’ve thought that many times. Today I checked the suggested features and sure enough, it’s been requested and fulfilled. But it’s hidden!
Skim also has a few unlisted shortcuts to make life easier. Some only work in specific tool modes or when a note is selected. These shortcuts only work when the main PDF view has the focus.
space, ⇧space, page down, page up scroll page down/up home, end first/last page →, ←, ↓, ↑ scroll ⌥⌘→, ⌥⌘←, ⌥⌘↓, ⌥⌘↑ change tool mode →, ←, ↓, ↑, ⇧→, ⇧←, ⇧↓, ⇧↑ move selected note return edit selected note ⌥⌃→, ⌥⌃←, ⌥⌃↓, ⌥⌃↑, ⇧⌃→, ⇧⌃←, ⇧⌃↓, ⇧⌃↑ resize selected note ⌥→, ⌥←, ⌥↓, ⌥↑ move reading bar ⇧⌥↓, ⇧⌥↑ resize reading bar ⌥tab, ⌥⇧tab rotate through notes and links ⌥escape deselect active note t, n, c, b, h, u, s, l, f change note tool mode (only in note tool mode)