Sharing files, photos & tools to enable people to send you files

I'm looking into ways for hens to send me photos for a photo albumn.
I don't want to spend my time downloading photos, but want a way for people to just add photos they find over time on the run up to the hen do & then, when I come to making the book, I can pull them all together.

Options:
Have or want to set up a drop box, there are ways for people to email files to go into your drop box.
http://www.dropbox.com/ Drop Box is free for up to 2GB

Ways for people to send files to your drop box:
Get AirDropper to enable others to allow nominated email addresses to send files to your drop box
https://airdropper.com/ - However you need to supply card details to sign up.
Article that explains it.
http://www.howtogeek.com/howto/33115/get-files-sent-to-your-dropbox-via-email-or-a-webpage/

Other options - You send it: www.yousendit.com
a free way to send files too big for email