I recently discovered Streamload, which gives you 25GB free online storage! You can back-up/store any files you like. You can then download the files when and where you want. Far better than storing them in your Gmail account :)
Instead of emailing large files and clogging office email systems, Streamload allows you to upload the file to their system and it then sends a link to the recpients. Very nice for those large 5MB attachments. This is a free service.
You can even share selected files with anyone you like. For example, I can upload a presentation to streamload and then email a link to those I want to share it with; or I can post the link here on my blog and users can download the presentation. Checkout this WorldCup 06 file I've uploaded and am sharing - click here.