Sometime ago I've posted in the forum my wide version of the Jazzcafe theme. Now I've implementented a gallery to navigate and view all the images in a post in full size without opening any popup window.
Screenshot:

(You can view a running version in my blog: http://blog.santisi.com.ar/archives/50- ... 7-DIY.html )
The implementation doesn't modify the default rendering of the Jazzcafe template. I've implemented it as a JavaScript script that runs after the page is loaded, finding all the images in the post and replacing it onclick action.
Once the script is loaded, every post in the page makes a different gallery. Clicking on a image, it's opened scaled to the window size, and you can navigate through the gallery by clicking on the previous and next links or using the keyboard left and right arrows. To close the image, simple click on it or press the escape key.
I didn't check if the script works in other templates than Jazzcafe (it finds the post that owns an image by searching for an object with "post" class and recognizes the target likn if it's enclosed into a "a" tag with "serendipity_image_link" class, etcetera).
(I've reached the maximum of 4 links, so I will split the post in two parts.)