On the issue of image sizes, I have said this before, and I'll say it again....
REDUCE THE SIZE OF YOUR IMAGES TO A MAXIMUM OF 1200 WIDTH!!
If you do that, they will show up full size on the forum, and with a small bandwidth footprint. (Under 500kb generally). Quality is NOT affected.
A lot of guys are taking their pictures at the highest resolution their cameras can manage. That's great if your planning on using the picture on a highway billboard, but it is totally RIDICULOUS if pictures are for use online. If you MUST take your shots at high megapixels, then do your viewers a favor and reduce the size of the shot BEFORE posting. Use Preview on a MAC, or PAINT on Windows. 1200pixels MAX width.
As some have said, working through thumbnails is a pain....ESPECIALLY when the resulting shot is 4 or 5 MEGABYTES in size (some even more!). Slow loadiing and takes up bandwidth, especially for those in countries where bandwidth is limited and paid for incrementally. The same goes for those people on the road and paying for bandwidth on their iPads, iPhones, and laptops.
PLEASE! We all want to see full size shots, and if you'll reduce the pixel sizes, they will come up fast, low bandwidth, and still at a quality level that is not reduced.