MindJet unveils an OPML Editor product that supports SSE:

"The Mindjet Labs has just released a new Mindjet MindManager Pro 6 OPML Editor. The Editor enables users to open, edit, and save Outline Processor Markup Language (OPML) files in MindManager Pro 6. The editor also reads and writes the Simple Sharing Extensions to OPML introduced by Microsoft under a Creative Commons License."

Via Jim McGee. Thanks to Shawn for the tip.