Data: URLs
Data URLs are a facinating way to reduce the number of small data requests — to transmit small images along with the main HTML document, for example.
The following applications support data: URLs:
Example (please view source): 
Update: Phil Ringnalda points out that since Microsoft IE doesn't support these they aren't as useful as they could be. Which is true. And I should clarify that there is a size limit to the length of the URL. SGML limitations mean that the maximum length is about 1K, so this will only work with small images.
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