PrivacyStar let us know they are running a sweet giveaway for their call blocking application. The way it works is they are giving every 25th person who registers for a 7 day trial after downloading the application a free copy.
You just need to download the trial at this link in App World
As a reminder PrivacyStar lets you query for the caller ID of any number in your call log just by using a menu option. It will also let you block unknown or private numbers of based on caller ID. They also let you report violators of the Do Not Call Laws.