YES! You can have more than one. Rumor has it you can have up to two unique tabs on your Fan Page – but I’ve done three on a page without problem.
The trick is figuring out how to get the FBML box for the new tab.
Here’s a quick tutorial.
Go to your existing FBML box and look at the very bottom. You’ll notice an link that says “add another FBML box”
Now, type in your text, add the HTML code, etc in the new dialog box. Don’t forget to rename the box.
Of note: this FBML box will automatically be added to your boxes area on your Fan Page – if you want this to be a new tab, or canvas page you need to return to your editing area on your fanpage.
Select the application settings.
A new dialog box pops up that allows you to change the new FBML box to a tab.