Runs on the big three desktop platforms (Mac, Windows, Unix)
Required to run in a headless enviornment, as well as a desktop image
Talks to the world thru some standardized XML-RPC protocols. The Blogger API is a subset of the MetaWeblog API. (Look at XML-RPC Server for some Squeak related overview and code).
Blogger API
MetaWeblog API
RSS 2.0 feed (RSS- Really Simple Syndication; another datastructure defined in XML)