Problem:  You want to send someone a large file but your email provider doesn’t allow attachments over a certain size.

Solution (in no particular order):

• http://senduit.com/
• http://rapidshare.com
• http://www.mediafire.com/
• http://www.filemail.com/

These service providers allow you to upload a file.  You get a web link to that file, which you can email or IM to the person you wish to download the file.  That person simply clicks on the link, and begins the file download.

NOTE:  Most of these sharing sites do not authenticate the downloader.  This means that if someone guesses the URL of your file, they too can download it.  While this is not likely, it should be something you are aware of.  You can add another layer of security by zipping the file with a password, or encrypting the file before uploading.