mh-shot-tool handles portrait mode (which is why I switched to it) and shows a preview with options "Flickr this" and "Save As..." after a capture. You can also do arbitrary delay. It saves as PNG only, unfortunately, but that's better than JPEG only... (I just wish it could auto-JPG to save me a step when attaching shots in itT forums.)

It's in the maemo-hackers repo; consult gronmayer for details...