Thanks to a tip from our resident "Man in the Woods" Jimbo,

I've been using Photobucket for that exact thing for the last year. High school baseball photos last Spring, travelling team soccer photos last Summer, and last Fall I was made the "official" team photographer for my daughter's varsity soccer team.
Many of the parents commented on how much they liked the site, how easy it was to use, etc.
(And, yes - You can password protect different albums - if you want to make an album for "Baseball 2012", and only allow the parents to whom you provide the password to have access.....)
Hope that helps,
Tim