Have been out for a couple of months with a back problem and subsequent operation but am getting back into things now. There was a useful webcast whilst I was off showing the power of the dataview web part:
which had a couple of really useful things in. Maybe I am being blind but I can't see how you can rerun this webcast from this page…
One thing was passing parameters through to the dataview which I think is also covered in someone else's blog and there are details of this here:
http://support.microsoft.com/?id=831093
I've now used this a couple of times and it's really cool – for example if you want to pass 2 dates through to a calendar and only show the entries between those two dates.