Ringtone Junkie for Blackberry allows you to download, store, access and assign custom ringtones to contacts in your address book

• Download: Unlimited access to the basic ringtone catalog, as well as pay-per-download ringtones from the premium catalog.
• Manage: View any MP3 you already have on your phone or memory card, regardless of where it was downloaded from.
• Assign: Make any MP3 or existing ringtone the default for calls, SMS, or emails; select a specific ringtone for any contact in your Address Book.
• "A free, no-risk trial period gives you two free downloads from the basic catalog and access to what’s available in the premium catalog."
• "If you like what you see, pay $19.99 for unlimited basic downloads and access to the premium catalog."