PS all working great, but the first run after I installed it, I went straight to Latitude and enabled it, then clicked the now-green Authorise button; it then just hung showing the busy 0101011-thingummy waiting animation. No browser opened, nothing happened at all. I had to kill it as the "Cancel" (or Abort or whatever it was) button didn't do anything.

When I tried again it did exactly the same thing; when on the next run (this is all having not yet rebooted the N900 since I installed it), I went to facebook places first - that worked just fine. Once I'd auth'd facebook, latitude then worked and opened a browser, but that might be a bug to look at. Unless my browser was just acting up (its the regular microb, no browser switchboard or anything I can think of that might mess with running a browser from an app).