File sharing for any occasion

There are many great FREE tools for sharing files online. Since many of you will be restricted in file size as to what can be sent or received in your regular email system, having access to other file sharing methods is crucial. Here are some options:

Synchronous sharing (sharing parties are online at the same time):
1. Most chat programs can send and receive files
2. Use Skype for file sending (see picture below)

Asynchronous file sharing (parties are not online at the same time):
1. Dropbox (up to 2 Gb free)- good for one-time file sharing, or storing things you must have access to always
2. Google documents (for office files, sans the new x format like docx,... -- good for collaboration)
3. Office Live (great for collaboration)