You can comment on related blogs and use your affiliate link for your website.

A vast variety of ways where you can leave links to. Article Writing, with Domain redirects or some such.

Commenting; Forum posting (In some places allow direct affiliate links) - Very helpful to have your own website in this regard.

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One of the best ways to promote affiliate products in any niche is through article marketing. Though this may take more time, creating a lot of useful content that links to your product will create permanent one-way backlinks with your desired anchor text to your site. The more you create, the more backlinks you gain and you also get recognized as an expert in your niche in the process.

Article marketing, social bookmarking, forum posting, and blog commenting will all help. They key, though, is to make sure that everything is relevant to your niche. Look for forums and blogs that relate to your niche, and every time you post (with your signature at the bottom, of course!), you get another backlink.

In addition to the resource box, many article directories let you have a profile page, which also counts as another backlink. Just make sure that the content you publish is good, unique, and informative. No one wants to read a poorly-written sales pitch disguised as an article. Everything you publish is a reflection of you and your business. Make sure it's a good one!!

There are a bunch of q&a websites besides YA! including Mahalo, fluther etc... that you can use as well.

article marketing, social bookmarking and forum posting are the great ways to place affiliate or non affiliate links.

You can post article in Directories and put your link, social bookmarking, Blog post, Forum Post

Find a few blogs in your niche and ask the blog owners if they are open to guest posting. If they agree, they get free content which you have written and you get to insert your affiliate links. Make sure you inform the blog owners that you will be inserting affiliate links.

In search engine optimization (SEO) terminology, a backlink is a hyperlink from one Web page to your own web page or website. Also known as an inbound link (IBL), these relationships are important in determining the popularity (or importance) of your site. Some search engines, including Google will consider the sites with more backlinks plus pages of search results. Can also be written in two separate words, links back.

Submit your site in Do follow list like Bookmarking, directory, article, comment posting and forum posting its very useful to get backlink fast.

product reviews would help too..