Zotero is now a desktop application that you download to your computer. In addition, there is a browser plugin - the Zotero Connector - that works with Firefox, Chrome, and Safari.
Zotero will sync citations across computers (so you can have your citations stored on multiple computers).
Use Zotero Groups to collaborate publicly or privately with colleagues and friends.
Zotero is not recommended for students who do their research on public computers.
At Temple, contact librarian Fred Rowland: email@example.com / 215-204-3188.