Do you have a link to the haploid/diploid information on single celled organisms?
If my memory is correct, haploid is meiosis (reproductive cells in sexually reproducing organisms) and diploid are somatic cells.
I haven't found a good one yet but this might be a start (fairly technical, depending on your bio background).
It's just plants. I'll try to do more later today but I'm off to work now.
http://www.ucmp.berkeley.edu/glossary/gloss6/index.html