1. Join forums, forums are a great way to achieve links to your website. In most forums you are allowed to have a signature and in your signature you can put a link to your website. But another important note to look on is making sure the forum is somewhat related to your website. You will still get credit if it's not, but if it's related to your website than you will be accomplishing two tasks at once.
You will be advertising for your website (bringing in targeted traffic) You will also be building your websites presence.
Your websites presence is very important to your survival. The more people see, or hear about your website the more credibility you will have and this increases your chances of having these visitors come back and possibly become leads.
2. Submit to search engine directories. Search engine directories are a good way to get a free link to your website. They also increase your chances at being listed higher on popular search engines like Google, and overture.
Most search engine directories allow you to submit to their website for free. This will allow you to increase your web presence by being listed on another search engine, and it will also be a free link.
Remember the more links you have the higher your PR will be