I know that when you pay for hosting, you have to pay attention what eats your traffic, and images eat a lot of traffic, so many people host images on free servers, and free image hosting services. What do you use ? And why ? Witch one is faster ? I use Imageshack. You ?
My own image hosting site. Makes life easier knowing where my images are. And I know that it will be there for a long time, as opposed to other sites that may drop down because of bandwidth usage.
I sometimes use photobucket...(I use photobucket for any picture i post in my forums or my blog...but important pictures are hosted on my server itself...). I have used imageshack in the past as well...
My own server. I provide hosting for $6.25 a month PM if interested, and you could host pretty much all the images you wanted, and much more.