Gaining exposure and establishing credibility should be a top priority if you intend on being successful Online.Writing and submitting articles is arguably most effective free way to achieve aforementioned, but there is another proven self promotion method that is often overlooked ...
Regular Online forum interaction.
Discussion forums, bulletin boards, Online communities, group chat, etc., in other words, a group of individuals with a common interest that share an interactive environment.
Every niche market has one or more of these high exposure, hot beds of interactivity available to them, and numbers continue to increase.
Reputable forums do NOT tolerate outright promotion, allowing (in most cases) only a signature file as identification.
This is actually a key benefit, as it helps maintain a controlled environment, setting stage for positive, content rich interaction.
Once you've established yourself through regular postings, level of trust, credibility, acknowledgement, and exposure you achieve will increase, commensurate to how well you're received by your fellow members.
Here is a list of Internet Marketing forums that I frequent:
Anthony Blake Online - Entrepreneurial Success Forum http://www.ablake.net/forum/
Bryan Hall's Success Network Forums http://www.bryanhall.net/members/forum/index.php
Neil Shearing's Internet Success Forum (member's only) http://www.scamfreezone.com/privatesite
Jim Daniel's BizWeb 2000 BB http://www.network54.com/Hide/Forum/184615
Klaus Dahl's Forum http://www.klausdahl.com/forum/index.php
Lesley Fountain's Friends In Business BB http://www.friendsinbusiness.com/board1/