On a related theme, I often see broken images when viewing RSS feeds in news readers — once upon a time I had the very same problem in my feed. The reason: relative URLs.
For example, let’s take the image of myself. If you looked at the HTML for this particular image you would see something like this: <img src=”/images/me.jpg”/>. Works fine in a browser but try it in a news reader and … broken image. To view the image in a news reader the link should be: <img src=”http://simonbuckle.com/images/me.jpg”/>; notice the inclusion of the (full) domain name. Perhaps that’s another idea for a WordPress plugin: for each blog post add the domain name to any relative URLs to avoid things like broken image links.
In summary: check how your feed looks in a news reader! Your readers will thank you or, at the very least, you won’t look like a dumbass.