1. Write articles
Writing articles alone won't get you one way links, but if you submit it to articles database online, you will gain many one way links. The article database site will give you a link back AND the webmasters who reprint your article on their site will also give you a link back! If you write and article with a catchy title or in-demand content, you can get published hundreds of times online, which will give you tons of backlinks.

2. Participate in forums
In forums, you can usually have a link in your signature. This used to work extremely well about a year ago. Today, it is not as efficient, but it can still be good to do it sometimes on highly popular forums.
To submit your link in forums you have to learn BBCode let i explain you..
when i visit any forums and discuss in it. i place my link( http://imall.weblodge.net/ ) and want to put link as directory submission service. then i will put it like this way
[url=http://imall.weblodge.net/]Directory submission service[/url]
common BBcode for forums is like this...
[url=http://url]URL text[/url]
For Making bold text
[b]some text here[/b]
for adding color
[color=blue]your text[/color]
i strongly recommend you to read rules before you post any messages or link in any message board.please don't SPAM.
I have created a list of some top article submission sites and message boards. you can visit it here.>> http://imall.weblodge.net/pages.php/page/list

3. Participate in blogs.
Blogs are similar to forums. They get spammed a lot, but if you take the time to write useful comments on some of them, you can get some good one way links out of it.

4. Ask for it!
Do some research online for sites in your industry with a high ranking in the search engines. Send an email to the webmaster and tell them you think your site could be of interest to their readers, and ask them to put a link up! This can be time consuming, but it can sometime get you link on very high ranking sites.

5. Submit to directories
Also a time consuming job, but manually submitting to directories will get you many owe way links because a lot of them don't ask for a link back. Don't use a software to automate the submission though, because you can actually hurt your ranking doing that.
please read my Guide of Directory submission for more Details..
Here is list of top directories>>
http://imall.weblodge.net/pages.php/page/list

6. Write useful content
If you have very interesting content, or a cool tool on your site, people will naturally link to it!

7. Give testimonials
If you use a product, or read a book, and really like it, send a nice testimonial to the website owner. Many will give you a link back on their sale page. This gives you a one way link and often, quite a bit of traffic because people are curious to find out more about the person who gave a testimonial!