The single most important factor is a good product. No matter how good your site content, SEO or linking if you do not have a good product your business will fail. It does not matter if you are selling a product, service, information or just plain you. Is it sellable?

The Youtube videos from Blendtec where they blend Golf Balls and Coke Cans was very good advertising. Blendtec made very good use of Web 2.0 with no advertising budget. The videos have been watched by millions of viewers and sales of blenders have increased dramatically.

However, Blendtec have a very good blender.

If like the majority of products yours is no different from many others, you will have to show the potential customers the advantage of buying from you. If not the potential customer will within seconds be looking for an alternative vendor. It could be quality, price or service. Spend time thinking why a customer will want to buy a product from

So, before you start working on getting those high search engine rankings in Google and Yahoo, make sure you have a good product to sell.