a good read there hospitalera - perhaps important to know.

and taken from the terms of use - if you have any images 'shared' there

by submitting, posting or displaying Content which is intended to be available to the general public, you grant Google a worldwide, non-exclusive, royalty-free license to reproduce, adapt, distribute and publish such Content for the purpose of displaying, distributing and promoting Google services." Thus, since your content is "available to the general public", and further, you've granted Google the right to "distribute" your work, "royalty-free", all recipients of the images recieve a royalty-free license to use them.

This is very bad news for the photo industry in general and stock photography specifically.

I would suggest searching for your images on Picasa to make sure that they aren't being given away for free.

I searched Picasa for "istockphoto" and it came up with 56 images.  Some of them are actual images that are being sold on IS.  Here is one example:

Picasa:
http://picasaweb.google.com/lh/searchbrowse?psc=G&filter=1&q=istockphoto#22

iStockphoto:
http://www.istockphoto.com/file_closeup/music/styles_of_music/disco/1386657_pink_disco_ball.php?id=1386657

I searched Picasa for "Shutterstock" and 98 images came up.  Some of them actually still have the Shutterstock watermark still on them.  Here is an example: http://picasaweb.google.com/esdrasnic/Paisagens1/photo#5078927035020710354

I searched Picasa for "Dreamstime" and only 4 images came up.  Here is one of them:

Picasa:
http://picasaweb.google.com/lh/searchbrowse?psc=G&filter=1&q=dreamstime#1

Dreamstime:
http://www.dreamstime.com/a-pair-of-stress-balls-image597291

I searched for "Fotolia" on Picasa and 187 images came up.  So it seems that Fotolia customers care the least about copyright law.

I think that Istock image was a freebie once, I think I saw it before.

Leaf, that frost one isn't yours is it?  I thought I might have seen it before as well.