This forum already helped a lot on many newbie questions (for example: the most instructive How-To-Disable-'Faces' discussion, the odd database organization without clear folders, assigning a Place, extended EXIF data where?, etc. ).
I too just start 'from scratch' (brandnew iMac-iLife 11), and imported my first images in iPhoto 9.1.1.
Unless I missed it in browsing all topics and did not discover this 'needle in a stack of hay', I wonder what the transparent flag in the upper left corner of any image, hovering over it, is for. Merely a detail - even probably a dumb question - but nevertheless: nowhere found in any help file by Apple. More luck with you guys?
iMac (2,8 GHz Intel Core i5), Mac OS X (10.6.6), 8 GB 1333 MHz DDR3
Click on it to Flag the photo. You can do various things with flags - it's handy way of making a fast selection, for instance. Say you're looking for a group of photos for some reason, but don't want to make an Album. You can use flags to move photo between events and so on.
I read about the various opportunities a 'flag' can offer indeed, but did not see what it's transparent version meant. If I understand you correctly, does it simply refers then to the possibility of using the red flag symbol on the left side of the library to 'mark' images?
Do you know if it is possible to flag every occurance of an image? When a photo is in "Photos" and in several "Events" and "Albums". The only way I have been able to get this done is to search by image identity, but that can get to be labor intensive.