Maximum value for height is 400, default value is 31.
Here's an example of how the image stuff might look in your feed:
<channel> ... <image> <url>http://www.shoppingpr.com/img/rss_banner.gif</url> <title>www.shoppingpr.com</title> <link>http://www.shoppingpr.com/jonathan/</link> <width>111</width> <height>32</height> <description>www.shoppingpr.com features tips, tricks, and bookmarks on web development</description> </image> ... </channel>
Despite the lack of support in most RSS readers, I still think it's a good idea to include it. And for you stat junkies out there, when a Bloglines reader accesses your feed, it'll load the image from your server. Now, you can get a more accurate picture of how many people are actually reading your feed.
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