@sonofjay99: Have you opened the Zotero pane? Click the "Zotero" button at the bottom right, or select "Zotero" from the Tools menu in Firefox. It sounds like you might be looking at your online library, which will only show items once you enable syncing in the Zotero preferences.
If you haven't yet, take a look at the tutorial videos.
If you have tried all this and your items really aren't showing up in the Zotero pane at the bottom of your Firefox window, please write again; in that case, there's something wrong.
@ajlyon, I am referencing the online library. The tutorials say that it should automatically sync (I have "sync automatically" checked in the preferences menu under "sync"). My green circular arrow is spinning and spinning, but nothing shows up on my online library. I had this problem at home on my mac and am now having the same problem with my work computer (a pc running vista).
Upgrade Storage
If you haven't yet, take a look at the tutorial videos.
If you have tried all this and your items really aren't showing up in the Zotero pane at the bottom of your Firefox window, please write again; in that case, there's something wrong.