Check out this Chinese military exercise They're like space-age ninjas.
Check out this comic strip, Dr. McNinja. It's really awesome. I suggest not starting in the middle of the story though. They tend to get pretty ridiculous.
Another ninja comic strip is White Ninja. It's not quite as good in my opinion. Tends to be extremely random and kind of hit or miss as far as hilarity.
Then there's these urban ninja people. Freestyle walking or whatever. I'm not that impressed.
Then of course I can't forget Ask A Ninja:
