iPhoto is one of the coolest software for Mac, or maybe not. Google heard that many people complained about Mac's photo management tool and started to work on a Mac version of Picasa.
Until Picasa is released for Mac, Google has created a small utility that allows you to upload your albums to Picasa Web Albums (you can upload photos from the web too, but it's not easy if you have many). You can upload the albums from iPhoto or using a standalone utility. You just need to download a small application and have a Picasa Web Albums invitation from Google.
I know some of the visitors of this blog use Mac (around 6%), so I'd be grateful if someone tries the tool and shares his/her impressions. Some screenshots would be nice too.
Related:
Convert Windows XP into a Mac
Google software for Mac: Video Player, Google Earth, Sketchup