www.simplefileexchange.com

This website as the name suggest is very simple to use and user friendly. You just have to select the file you want to share , enter the email address for "to" and "from" fields, write a short message and click on sendit button and you are done.
The will get uploaded and there receiver will receive an email with the link to download it. You can also see the same link so it can be sent to others as well.
The transfer does not require any password.

4shared.com

Living in the digital environment you might need to access your data from anywhere.

The need to send out any work document or personal files may catch you by surprise anytime! In the car, at lunch or even on the go.
With 4shared Desktop you can forget about loosing data because of any interruption.
You can register for free and get 10GB of free space. For more features user need to upgrade their account.

www.pdfgeni.com

This site allows user to search for .pdf files available on the net. It's a search engine for pdf files. The site is free to use.