Just today Facebook has opened its doors to allow you to send an email invite to your Email contact list to visit your Facebook page, and its incredibly simple. The implications are huge. Send a Facebook official Email invite for people to check out your Facebook presence.
Obtain an Outlook, Constant Contact, or .csv file, of your email list.
Underneath your profile picture click the Edit Page button.
Select the Marketing button. Then the Tell Your Fans button
Upload the file and send out your invites.
Its just that simple and will be sent out from Facebook itself. Facebook does put a limit of 5,000 emails to a send, so if you have more than that in your list wait a day or two to send the rest of your list. This is should be a nice and easy way to increase the number of followers you have on your Facebook page.