If you are running Windows XP or Vista, go here and download Opanda IExif 2.3 freeware utility. Once installed, just right-click on a photo and select the Exif option listed in the pop-up dialog.
that's a convenient firefox plugin but in resizing or post processing then uploading to Flickr, photobucket, etc. the EXIF data for a lot of pics gets stripped out.
I like the FxIF plug-in for Firefox the best. I have also used the (creatively titled ) "Exif Viewer" plug-in but sometimes it's almost overwhelming with info. The FxIF one generally gives you what you want to know, quick and easy.
(And as always - if you're not using Firefox, you should be! )