Since your kindof a techy Danny heres one for you if you havnt scene it.

Free, puts up high res pics in low res intervals so you could post a HUGE picture and let users zoom in and out and pan.

Here's a sample though the pic is not that high but you can zoom to the letters on the helmet. If it was high enough res it would be clear.

left in, right out, click drag pan.

http://www.i386group.com/zoomview/DSC01313.html

Let me see if I can dig up a better picture to demonstrate what I mean.

Better but res is still low.
http://www.i386group.com/zoomview/carview.html

THe point would be that you could post a file that was say 40 megs due to res but Viewer wouldnt have to sit and wait for 3 minutes for it to show, it shows as the small file but still navigatable and ability to drill down into the picture.

They added a plugin to photoshop but the original app has a greater finite control of the zoom levels and such.

Anyway, thats enough now.
Burr