Rather than attaching the photos, upload them to a photo sharing site (I like
www.smugmug.com), then go to the site, find the photo you want to add to your NCT post, right click on it, select "copy image location" from the menu (Vista -- may be different in other versions of Windows), then go back to your NCT post and click on the photo icon (a yellow box on the menu bar that's apparently supposed to resemble a postcard with a mountain and the sun), paste the photo location there, and voila! This allows you to select the size of the photo you insert, and the display quality seems to be better than with attached photos.
Like this: