Hi! I �m always afraid to use images from picasaweb in my worksheets because most of them cannot be redistributed due to copyrights. In the first link given, flashcards do not belong to the author who published them on the site. They belong to a well known publisher. So, we must be really careful when using images from that site. I myself have reported it several times for abuse. of course there �s no problem if we just want to use it in the classroom with our own students.

Many of those flashcards that can be found on picasaweb go together with different coursebooks. I have many of them myself. Just if you do not want to buy them you can print them for your personal use, but you certainly can �t upload them on different sites as your own work.