What is the simplest way to send a large batch of pictures to a distant friend or colleague? [duplicate]

DROPBOX!

Dropbox acts like a folder on you computer. All you need to do it to drag and drop. You have 2 ways of sending the images:

(1) Using the public folder. You will be supplied a URL which you can send to your friends. This is less secure as someone else can download the images (if they somehow manage to randomly guess your URL). One workaround is to zip all the images, then password protect the archive. You can then send the password to your friends separately.

(2) Have a shared folder. This, however, requires your friends to download DropBox as well.

It can give you up to 8GB of space (2GB when you first use it).

16 gig SD card sent by postal service - then they can send it back to you with their photos. Cost about 1.00 USD round trip.

Torrents are one of the best ways to send large files. Just make a private torrent and let your friends download with their client of choice.

Isn't this exactly what sites like https://www.yousendit.com/ are for?