I was recently pondering on the same subject. How to send a larger file bigger than the 20MB limitation offered by an ISP or in the case one doesn't have or care to have an IM program (AIM, MSN, Yahoo Messenger).
I came across these two sites that provide an answer on how to send big files.
http://mashable.com/2007/05/23/7-way...er-than-gmail/
http://www.makeuseof.com/tag/easiest...nd-your-files/
Hope this is useful to others.