@jonny a bit of setup, but people are tacking ".rss" on the end of profile or hashtag URLs to get RSS feeds, feeding those through rss2email then using various email sorting/bucketing algorithms. Having something do that in a single client would be advantageous.
@keverets
that's amazingly creative. I'd love to see the code for that. I was just thinking about crawling it and doing batch exports from Special:AllPages comparing edit datetimes