Post to forums and blogs
There are zillions of web forums and blogs on the internet with millions of users.
Many forums have sections for downloads, and some are even dedicated to solely providing files.
Upload a file that you know will be popular and post it to some active file sharing boards, and let the downloads roll in.

Use peer-to-peer file sharing networks
Millions of people use emule, bittorrent, limewire and other peer-to-peer file sharing networks today, creating endless oppurtunities for you!
For example, you can create a zip file with a passworded zip inside. Leave a readme.txt saying to retrieve the password
for the inside zip archive at your download link here on NetGull! You'd be surprised at how many people
will start downloading your text file!

Use video sharing websites
Youtube, Metacafe, Veoh and other video sharing websites are the new fronteir for internet marketing.
By simply creating a video about a program, a song, a band, etc, and giving the user a download link
in the video description or in the video itself will score you thousands of downloads, and dollars!

Find the right files
There are millions of uploaded files on the internet, but you want to find the one that will be the most popular
and get the most downloads. These normally are videos of some popular event, like a soccer tournament,
pdf's or free ebooks, game demos, game cheats, music files... the list goes on and on.
Just make sure the file is not copyrighted or sexually explicit!