Sweet! the lilacs are coming!
And aren't you curious about exactly what day I took this photo? What camera I used? The lens? (16-85 mm Nikon) The aperture and distance and speed? (f/5.6; 85mm; 1/100). You could find out this and all kinds of other exif information (200 ISO; manual mode; sRGB embedded profile; center weighted metering mode; CS4 editing; no flash; original color space RGB; auto white balance).
OK, OK, maybe you really don't care about MY photos exif data (and I don't really know what "exif" means, other than "lots of data"), but you might really want to know this stuff about another photo.
Well, Jeffrey's Exif Viewer provides a button you can add to your browser toolbar, and extract this information from a photo. The photo has to have its exif data enabled. That means that if you want to enable exif info in your own photos, when you use "save to web" in photoshop, you also check off the little option that comes up that asks if you want to enable this information. It's also a good way to make sure that your browser will use the actual color space you have embedded in your photo, rather than just arbitrariy pick whatever it happens to be in the mood to use. (Darn those cyclothymic browswers!)