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The button combo thing doesn't work the same for all versions of Android, and on some phones it won't work at all. The beauty of fragmentation, I suppose. Back and power buttons work for some Android 2.2 phones, and back and home does on others. Power and either back or home works for some 2.3 devices. For 3.0, I don't know of any combo that works. It is easier on 4.0 devices, which use volume up and the power button.
There is an app that works on most non-rooted Android devices, but it cost $5.
If you have rooted your phone, there are free apps on Google play that work great. I use aScreenshot, which lets you take a screenshot by shaking the device or pressing whatever button I assign to trigger it.