There are a lot of videos about the Blackjack up on YouTube. Here are some of them. They may be useful for you if your thinking about buying a Blackjack.

Cingular Blackjack Video 1st Look - from Mobility Site

Samsung Blackjack vs Treo 700wx

Using the Blackjack to Access the Internet on a Laptop

Cingular Blackjack 3G HSPDA Speed Tests

Cingular 2006 TV commercial "blackjack"