<font color="blue"> ( What size works optimally for TBN? ) </font>
Optimally, I suppose a 1x1 /forums/images/graemlins/grin.gif
You are looking for 100K or less -- and a 600x400 image is large enough for anyone to view on the screen and requires less compression to reach 100K which gives a much better quality image.
FYI, your new camera has a 3:2 ratio (i.e 600x400, 1200x800, etc.), and not 4:3 (i.e. 640x480, 800x600, 1280x960, etc.), as many point-and-shoot camera's have.
Now, getting this thread WAY off topic:
If you plan on printing your images (and I don't mean with your color printer at home), use 300dpi as your guide. So, if you want to print 4x6's your looking for a filesize of 1200x1800; 5x7's -- 1500x2100, etc.