When Silverlight 2.0 was released, it came with the ability to view image pyramids built in. The feature is called Deep Zoom and it's a very interesting function, you can find GREAT examples of Deep Zoom usage over at www.deepzoomstudio.com.
Deep Zoom at it's most basic form is to allow you to see BIG pictures without downloading the whole thing at once and killing your bandwidth. For example, this knife picture below is a demonstration of Deep Zoom.
This is the RAW untouched file of the image I used in my Leatherman Style CS review, straight from the camera its 4592 x 3056 in size. And it's of course unheard of to upload the raw image onto the web for viewing purposes. But thanks to Deep Zoom and the spanking new http://www.zoom.it it's no longer a problem.
All you have to do is first upload the big original image into a PUBLICALLY ACCESSIBLE location like Flickr or Live Photos, then go to Zoom.It and drop the URL of the picture into it and it'll spit back up a link or script which you can use to show people your extra large image file all nice and viewable in a zooming viewer.
Deep Zoom has a few issues in practical applications, The Semi Pro feels that it encourages WAAAY too much pixel peeping if you apply it onto a normal picture. For example... here's a panoramic shot straight from the NEX-3 in WEB safe resolution.

Generally looks fine, and people won't care too much about the stitching imperfections etc. etc. But... if I allowed the viewers to see the ACTUAL image, what would happen then?
What happens when they can see all the imperfections? Pixel peepers would just use it as an opportunity to find problems in your equipment and editing among other issues.
The other problem... is the FEMALE issue. If you told your model that you're going to allow people to be able to inspect every SINGLE, MINUTE DETAIL of the picture you're taking of her, that any minute flaw that your lense is able to pick up, viewers will be able to see? Most likely they'll tell you to never call them again! This is because all the beauty is gone when you look at them up close! Can you find the mole on her left arm and leg?
This is not the best example... just be thankful there's no one around to take a picture of my face with the 50mm Macro. 
Zoom.it also work on webpages as well, so do check it out even if you know that if you used it on pictures of anyone, they'd probably kill you. And to cap it off, here's a self stiched panorama that's 9154x2395 in size. These are things which you really want to use Zoom.It on!