It allows you to get around being blocked from emailing large files as attachments. Instead, you just upload to Wikisend and get a url address for it.
Barry writes in his post about some ways it can come in handy, so it’s worth reading it. I know there are some other applications that sort of allow you to do something similar, but those that I know of require downloading software. This one seems like the easiest.
I’ve posted the link on my website under….Sending Large Files.