Papers is a reference management software for Mac OS X that has been gaining popularity throughout its last release cycles. While it works in a single computer like a charm, if you would like to share your library between several computers, there is not a native solution to it.
This can be circumvented by using Dropbox (free) to host your Library. You will have some space restraints obviously and you’re dependent on an internet connection to update your library. There is also the additional problem of working offline at two locations and then trying to synchronize will just not work. One of the offline versions of the library will be overwritten. Still, if you want to have a library at home and one at work, this might actually work :)
EDIT: I was testing this this afternoon and apparently you should give it enough time after you make changes in one computer for dropbox to sync. Otherwise, you’ll get trouble! So, if you wanna sync properly, get a beer, and then come back.
João tells me that Mendeley, which is free by the way, has a server that hosts up to 500MB of your library. It might be a better solution if you’re looking to start a new library. However, if you’ve paid for your Papers library, this Dropbox+Papers solution might come handy! And you always have Zotero, that despite being browser-dependent and not having some of the features both Papers and Mendeley have, has also proven to be quite the popular solution.
Comments and suggestions! And let the reference manager war begin!