I've seen that a lot of people are having trouble with the screen capture function on their Samsung Vibrant SGH-T959 device (using Froyo 2.2). Well, your troubles are over. I was one of these people struggling with the issue of not being able to take screen shots with this particular phone and was unable to find the app in the market because it's "not compatible." I went through the trouble of finding the apk file and manually installing it. Guess what. It does work and it IS compatible. So I'm going to post the link to the file here.
Screen Capture Shortcut Free
If you don't know how to manually install apps on your device, here are the steps:
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1. Plug your phone into the computer via USB and mount.
2. Choose the option to browse files.
3. Open the download folder and drag apk file into it.
4. Go to Applications > Files > download - select the Screen Capture Shortcut Free file and install.
5. Enjoy screen capturing.
Screen Capture Shortcut Free
If you don't know how to manually install apps on your device, here are the steps:
---
1. Plug your phone into the computer via USB and mount.
2. Choose the option to browse files.
3. Open the download folder and drag apk file into it.
4. Go to Applications > Files > download - select the Screen Capture Shortcut Free file and install.
5. Enjoy screen capturing.