After some fiddling and tinkering, I finally managed to get a simple lightbox installed to let you view the images full-size. Currently it can only be launched via the text link right beside the timestamp, but I should hopefully figure out how to launch it from the image itself soon enough.
Currently the feature is available only on the main page and the View Post page. There is a minor bug in the lightbox where it will create a slideshow list of all the images linked on the main page. Not a huge issue, except that if I link to an image from inside a post, that image winds up in the queue. For example, if you were to click it from this main page you’d wind up with a world map, courtesy of one of my New York Skyline post below. Not a big deal, just a heads up.