If you do not like having to create new accounts and then upload files, you can share files directly from your PC.
Opera 10 beta has a feature called Unite.
http://unite.opera.com/
It will sync a folder (subfolders) on your computer and give that folder a website address. (computer.username.operaunite.com). So my folder would be synced up under "laptop.griffonwing.operaunite.com". But I don't currently have the plug-in installed.
It's great if you have small files you'd like to share, and not have to worry about remembering where you uploaded them to.