There are a lot of file sharing apps and services available. I just learned about Fyels from Lifehacker (another great resource).
Fyles is extremely simple and easy to use. The site is pretty much an empty page. The image above is the starting page for it. You simply drag and drop a file onto the web page and then it gives you a link that you send to whomever you are sharing the file with. Doesn't get much easier than that. There is no registration required. There is a 2GB file size limit though. You do get a password for each file you share so you can go back and delete it off their servers if you want.
This is another great way to share files with your students or colleagues (or friends).