If you do however want to send a large file or a few large files to someone via email, and don't want their inbox to become blocked with your files, you can send the files via a service like sendover:
http://sendover.com/
This will upload your picture to their servers, and then they'll send your friend a link to the file you uploaded to their servers. So the file itself is not in their inbox, just a link to it, and hence their inbox will not be filled up with your pictures.