Bruce,
There is a reason for the resolution the pics are in.
I upload the original resolution image (JPEG) to my pic viewing site, Smugmug. Smugmug has the option to share the image in 3 sizes (small, medium, and large). I share the large size, which happens to share out as the resolution you are viewing.
I prefer to upload the native resolution for a couple reasons. One, I would rather not lower it if I don't have to as I can always go back and view the original, and secondly, processing this volume of pics, I don't want to have to create second copy at a specified resolution and upload that one as well.
Besides, if I blew them up even more, my flaws would be more readily apparent.
Ken