NB '<snip>' was just the first thing that popped into my mind.
[edited by: engine at 12:47 pm (utc) on Jan. 13, 2005]
[edit reason] specifics [/edit]
I would think a similiar rule applies here. With word of mouth, sometimes the plural can get lost. Folks may type in either and if you don't own both, you may end up losing customers to a competitor that snaps up your singular (assuming that down the road you build a successful site, which we hope you do!)
Good luck!