There seems to be some progress towards getting a fix for the OPML Editor/IE7 issue. I haven't got IE7 running so I can't test it, but it seems like opening up your OPML database in Frontier is one way to do it. Alternatively, you can edit the HTML file, or you can send your OPML database to a machine running another browser/OS (IE6, Mac etc.) and get them to edit it. If someone can send me an e-mail with what they need to change in the database, I'll publish it on my blog for posterity and future Googlings. 

Gareth Rushgrove has been working on parsing eRDF using JavaScript. Cool! It looks like it only works for properties at the moment, but it'd be great if this gets extended to cover the full eRDF standard. It'll also be important to make Sumo plugins for new non-eRDF GetSemantic formats.