Thanks, I'll have a go at uploading some piccies of my critters. Hey, I'll post a pic of a clone of the first stick insect that hatched out of those eggs you sent me, Mr Lutz
There may be a limit (I haven't checked) but it's a good idea to keep them to a reasonable size, if only for the sake of our poor modem users. Anything over 100k is extremely painful for them to download! There are lot's of freeware image resizer packages on the net. Why not try one or two?
Personally, I use MIR, which does bulk resizing and can be customised : http://www.acumensystems.com/mir/, but there are heaps more out there, and no doubt others will recommend their favourites.
Alternatively, when naming your albums/pictures, you could include the size of the pictures so that slow bandwidth users can avoid them if they so choose.