Now that I'm back on the Mac at home (and too lazy to re-install Photoshop for the time being), I've been looking for something to satisfy my Picasa cravings for quick and easy photo edits.
I think I've found it - a free (still in beta, but what isn't?) app called Picnik. It plays extremely friendly with Flickr, letting you upload directly to your account instead of doing the Picasa 2-step (export and uploading separately) and lets you search Flickr and Yahoo! images using interestingness and Creative Commons license info as well.
They are still working on some of their Creative Tools, but so far they have the basics and a cool special feature - vignetting! Another super bonus - unlimited edits, even if you've worked on a photo months ago you can still go back and undo,undo,undo. Glorious.
It's super-fast, free and easy. I am very happy right now.