Combined with my 24" imac this is taking me a long way towards the utopia of a paperless office. I use it for highlighting key points texts and research papers and then simply copy the automated notes it creates into my own study notes document. Great app. Would be great to see the annotations in preview, maybe I'm missing something.

An excellent and extremely useful little piece of software, much better than OS X's Preview.

A FANTASTIC app. I've used it to mark up research papers and it's great.

One complaint I see on this page is that you can't view annotations you make with Skim in other PDF editors. That's because Skim doesn't modify the actual PDF. It stores the "skim notes" in a separate file. You can still export the file as a PDF with embedded notes though... so you CAN share the annotations with others.

i hate this, i tried it... when you open the PDF's in preview, the notes aren't saved... so there's no point in sharing the PDF with others cuz they can't see your notes. best way to edit a PDF is probably with Illustrator or Acrobat Pro.

Skim is a very useful app, as previously documented here.
The only reason I still use preview is one bug in Skim when printing with the "reduce file size" quartz filter - instead of changeing the resolution, Skim changes the visible portion of the page, so you see only half of the slide :-(.
BTW current version should be 1.2 (38)

After I upgraded to Leopard, Preview began behaving very strangely, opening on my secondary (laptop) display instead of my main (external) display, which was a real drag literally. So I've found a solution in Skim for pdfs and ViewIt for most other image files. (Actually ViewIt will open pdfs also, but I like Skim's annotation features etc.

Looks interesting, but highlights don't work correctly for me: highlights on text in Skim doesn't show in Preview, nor in Acrobat Pro 8. :(
However, highlights done with Acrobat Pro 8, are displayed correctly, both in Skim and in Preview.

Skim is very useful for those who use Apple's Keynote on Leopard.

By cropping region in your pdf file using Skim, you can paste the region into Keynote. This very useful function that was unfortunately disabled on Preview.app on Leopard.

Such a loveable app.

Hah, I like to see all the people who use this the same way I do. I have a professor this semester who provides almost all course material by PDF and I desperately needed a highlight feature. That and a plethora of other useful features makes Skim wonderful for me.