300MB of photos and 2 videos per month
15MB/photo; 150MB/video or 20MB/photo; 500MB/video with a paid plan
Allows flexible public and private settings.
Not as easy to use as Picasa, particularly for uploading or editing, but has a larger and more passionate user community
Web, desktop (Windows and Mac), iPhone, BlackBerry
Weak privacy. Supposedly deleted photos are never deleted, and many cases of photos unintentionally being shared with the public or unintended Facebook friends
Very easy to use uploader (and viewer); album commenting and sharing requires very little effort
No desktop client; strong web and increasingly usable mobile platforms