DropBox is a great tool

Free product plug..

I've been using DropBox to create links to files that are too large to send in an email. 

With this link you can access up to 2GB of space for free.  That's a lot of space.

You can also use DropBox to sync between your computers, so no matter which machine you're on, you have the latest version of your data file.

Sign up for free and give it a try.  You'll find it also works on your iPhone and combined with Kobo eReader, also free on your iPhone, you can upload a PDF (eBook) to read in color on your iPhone or iPad all for free