PictSync allows you to easily synchronize your online & offline pictures.
PictSync contains three main views. The first one shows details on the sync as well as how many photos are matched, etc.
The second one (the 'eye' icon) contains a table for viewing your photos -- you can see which ones are matched up, which ones didn't and for the matched ones you can individually select which direction they sync as well turn off syncing all together (note that this is for one at a time -- if you want to turn off syncing in a global sense go to preferences)
Finally there is a console view -- normally you can ignore but it may contain some useful diagnostics.