It is quick and easy to sign up for a free account with ImageShack. Once you upload your images there, all you'll need to do is just paste the code they provide in a post and your picture will show up.

I prefer to use 'thumbnail code for sites', that way folks can click to see the full-sized image if they choose to see it, and don't have to bother with it slowing them down if they don't.

Here's a couple of clickable thumbnails:
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