Talk Android has posted a complete review of the Samsung Captivate. Overall the review seemed real positive except for the camera.
Now in my opinion, the biggest let down on this device is the camera. With the great pictures being taken by the Droid X, they simply fell short here. At the very least, they should have included a flash like some of the other Galaxy S phones on other carriers are getting.
The Captivate is a Galaxy S-based phone and features a 4in Super AMOLED screen with a resolution of 480x800. It has a 1GHz Hummingbird processor and 16GB of internal storage. It is scheduled to be released on July 18th, 2010 for $199.

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Source: Android News - Android Google Phone Forums