I like using Imageshack
... the really good thing about a site like http://imageshack.us
is that they give you a link to your photo that will post a smaller reasonable sized thumbnail copy of your photo to the Roadfood forum, with a link right next to it which can be clicked on to open a full, hi-res version
in a separate window.This avoids the problem where, when someone posts a large photo on a thread, it causes any text posts on the page to not "wrap" and you end up having to scroll right & left repeatedly to read the posts.
(btw: after uploading the image to Imageshack it's the link-version named "thumbnail for forums #1" that works on our forum)