Photobucket is an excellent photo dumping site. And it's free.
http://www.photobucket.com/You can "Save Picture As" whenever you come across images on websites and place them in an image file on your comp. Later, you can upload these images (or any others that you may have taken with a digital camera) to a Photobucket account.
I use it quite a bit.
Don't forget to use this format whenever you post the image to a forum (Photobucket already provides you this format with each image stored on their site):
"To display an image, you must surround the URL pointing to the image with
tags.":
(No space after the first
tag, of course. Otherwise the image won't display.)