There are 2 ways to add a new tab to the product edit page in admin panel of Magento.
First method: Let’s add a tab for a custom module. Add the following code to your config.xml file in the global scope:
After this you should create a new file: Company/ModuleName/Block/Adminhtml/Tabs.php The content of this file you can see below
The code above rewrites the system function which generates the layout and adds the tab. Next, you need to create a file: Company/ModuleName/Block/Adminhtml/Tabs/Tabid.php
Note: template should be in app/design/adminhtml/…/…/template/
Second method: Simply copy the file app/code/core/Mage/Adminhtml/Block/Catalog/Product/Edit/Tabs.php to a local folder (app/code/local/Mage/Adminhtml/Block/Catalog/Product/Edit/Tabs.php) and add the following snippet to the function _prepareLayout()
Hope this Magento tutorial helps!
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Source : atwix.com