I have a laser, we got it last year and it works well, though I am still trying to get to know it.
It is absolutely required.
What else...
I was thinking about one of those walk behind harley rakes
http://www.preseeder.com/news/. We can rent a big one when we need it, but maybe a little one can save us fixing up the jobsite, save on hand raking. I don't know.
I don't have a power head either, you know to run a paddle broom, hedge trimmer, etc
Blower, don't have it.
What else, plug of dip, Ipod....