i just downloaded picasa 3.8 from google, and i am VERY impressed with it, especially since its all free and stuff. BRILLIANT!! i made a quick collage of foods from bali, was pretty simple to do, but required a bit of fooling around first.
photoshop elements got really good reviews, but its not cheap or free. im happy to stick to picasa for now, i especially love the collage feature, which makes it very quick to put together, better then anything i have seen before. i also love the instant upload feature onto my blog! me loves google. :oD