I am looking for a tabbed PDF reader, preferably with annotation support (highlighting mostly) for Mac OS X. I looked at the Skim FAQ which said that tabs would never come to Skim.

I am currently writing where I need to have multiple PDFs open for reference (at the moment 17). This is a lot of windows which clutters upp my Exposé.

Does anybody know if such a PDF reader exists for Mac OS X?

I have had a look at Adobe Acrobat Reader, Skim, Preview.app, PDF Pen.

I found [Dioretsa](http://umappshare.amigasa.jp/Page/UM_App_Share/My_Software/Entries/2010/5/31_Dioretsa.html) which has tabs, but no sadly no annotation.

*Update 2015-11-20*: Funny how history repeats itself. PDF Expert recently released a Mac version (Readdle's PDF Expert for iOS has been around for some time). The pase years I have been using Preview, but PDF Expert is now my goto PDF reader with tabs and annotation. It's fast as well (which cannot be said about Adobe's PDF products).

*Update 2012-05-16*: Saving annotations in the PDF itself is also a must. E.g. Skim and Mendeley do not do this. Otherwise, Mendeley would have been a good choice.