Zapr is free
and lets you create URL links to any files or folders on your PC. You can then send these links to others (via email or IM or YOURNAME.zapr.com) and they can d/load the files or see the folders directly from your PC via any browser. They do not need to register or install software.
You can password protect for private use or leave it open for your blog/website.
Works without any port forwarding if you're/they're behind a router.
This tiny little app changed my life.
Hope it does yours.