Gecko, the core rendering engine used to render html in the Mozilla and Firefox browsers, has been ported to Pocket PC in the form of MiniMo. MiniMo (Mini Mozilla) is a stripped down browser utilizing the Gecko engine.
It sounds like this is a very preliminary port (IE "we finally got it to render a webpage"), however once it matures it could be a substantial revolution for web browsing on the PPC.
MiniMo for PPC can be obtained here:
http://www.mozillazine.org/talkback.html?article=6097
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Dan East