To send a file to someone with Jetbytes you simply:
You head over to http://jetbytes.com/ click the “Browse” button
Find the file you’d like to transfer and click “Open”
Jetbytes will create a link for you to send to email or IM to the recipient
They click the link and the transfer starts.
Once the transfer is complete you can close the page.
Why is this cool? Suppose you’re trying to send someone a large file as an email attachment, but their email service has a size limit on attachments (a 25 MB limit is not uncommon). This lets you send them a link instead and it won’t eat up all their inbox space. There is unfortunately a downside to this method: you have to leave jetbytes open in your web browser until they have downloaded the file. So it works best when you know they are at their computer.
Edit: Another way to go for online file transfer is DropBox. I've breifly posted on how to share files with it here.