Interesting topic. I actually mailed the guy who made Nivo to see if I could use it, and he was happy enough. I love it, so to add in a slider for it – well done. Why don’t you write up a tut for Nettuts because this is exactly the sort of thing they would pay for.
I thought the demo page says it’s free to redistribute and all that jazz?
I should do a write up, if I can remember how it all works when I’m done.