Found the NextGen Gallery plug-in a few days ago while I was looking for a plug-in to install a GPS image gallery. It was easy to employ and installed it into the sidebar of my blog immediately. I really appreciated how well the support material was written and how well the installment process was documented—screen shots and video.
Personally, I feel most WordPress plug-ins do not have well written instructions nor a accurate overview of exactly what the plug-in will do and how to do it. However, that being said, Alex Rabe’s plug-ins are the exception. He includes great support material.