Have a really big file you'd like to send someone? Sometimes email accounts have limits as to how much space they will hold. Gmail is great for large items, and it will hold over 2 GB of space. There is another online service called dropload.com where you can drop off your files for someone to pick up at a later time. Files are removed after 7 days. It's perfect for mp3 files, videos, etc. It will hold 100 MB of space. Not as big as Gmail, but useful nonetheless. Just don't store copyrighted items there.
Thanks to Jason for this tip!