Google Image Labeler
 

I noticed this, and wondering hmmmmm.

Feeling that alt tags are going to end up having even less meaning.

Welcome to Google Image Labeler, a feature of Google Search that allows you to label images and help improve the quality of Google's image search results.
http://images.google.com/imagelabeler/

Ok, so I can get points for helping to label images. What are the points for?

I've heard that users tagging pictures with Google Image Labeler is actually teaching their very smart script how to describe what's on the pics .
more in this article
So combining two above gives them very powerful tool that will tag pictures automaticaly and in the near future even more.

side note:
Few days ago I watched "Eagle Eye" and I don't think that this scenario is very far from today.

I had no idea what 'Eagle Eye' was so I googled it and ended up watching the trailer and it looked so cool I had to go out and rent it hahah.