Braeburn is a bright, clean and functional template using small icons for navigation. It also uses some JavaScript to show/hide the comments (and image notes, if you want). Designed for images up to 700 pixel width and now in version 2.0 for all images. HTML source is commented to make changes easier.
I only tested this for PP v 1.7.1, but it may also work with other versions, too.
You'll need the page-by-page archive addon (already available in standard pixelpost installation, just activate it in admin panel). The archive uses a tagcloud to display the tags.
If any error comes across please let me know at the braeburn forum thread.
//update: the thumbnail problem in the archive should be fixed now.
//update 2: Many people asked me for another version with fluid image width, so here it is! (With a few other changes). You can see a demo of version 2.0 at my photoblog: deenees view.
Overall, a very clean and functional theme. This theme gives off a very clean and simple look, yet provides a lot of functionalities under the hood. All the elements and information are well organized. The only minus is a visitor cannot easily navigate forward (only backwards) and the subtitle is not used or shown.
I was able to tweak the theme to my preferences without major problems. Overall, this is my theme of choice.