Still sorting out the Facebook e-mail sync kerfuffle that happened upon your defenseless contacts list? Luckily, Gmail will allow you to restore your contacts within 30 days of changes made to them. Google is known for having handy tools like this, but sometimes they're not in the most obvious place.
Here's how to get your contact e-mail addresses back from the cyber abyss:
In the app, it will be under Menu > Settings > Sync Contacts. If you don't see the option, go back to your Home screen and then press Menu > Settings > Accounts and sync and make sure the sync is disabled next to your Facebook account.
Step 2: Log in to your Gmail account on the Web.
Step 3: Click the small arrow next to Gmail in the top left-hand corner, and then select Contacts.
Step 4: Click the More button and select Restore contacts.
Step 5: The sync happened on approximately June 22, 2012, so adjust the days accordingly.
Step 6: Click Restore and contact e-mail addresses will return to their original form (sans the @facebook.com) in Gmail's contact list.
Step 7: Open the Accounts and sync area on your phone again (if needed), choose your Google account and force a sync for Contacts.
Hopefully there won't be another bug like this to send your Contact list into chaos. However, it's a good idea to keep contacts synced with Gmail in the case that you need to do another restore -- especially since Facebook isn't the only app capable of causing this kind of issue.