Picasa Face Recognition Feature

I am a fan of digital photography and my favorite photo management software has been Picasa for a long time. Google has recently released the latest version which is 3.5 and it means new improvements and new features are offered. Among all of them the new "Named Tags" feature is the greatest! What it does is:
First:
Once installed, it will start scanning all your photos for "face detection" and this might take a very very long time! for me it took about 24 hours as I have an archive of 20GB pictures! The result of this is a large collection of face thumbnails it has detected in all your photos.
Second:
Now its your turn to tell the software "who" is every thumbnail by naming them.
Third:
Picasa will categorize your pictures by person but you will notice a "Question Mark" on some of your pictures which means Picasa has categorized that picture but it is not sure whether he is the right person! So this is the tuning part which we are teaching Picasa about its face recognition skills!
For those with a large collection it will take a pretty much time to fix everything!

Picasa download page: http://picasa.google.com/