What some ways I can encourge my vistors to stay longer browsing my website?

Cheers!
A

Articles. Illustrations and images. These are some in the list.

A basic rule is: The better your site looks the longer they will stay.
Improve your linking structure by linking to many related articles within your site (within the text like wikipedia does)
This makes people surf around and more likely to click on an ad sooner or later

More quality info to read and more links to click
Or let them watch movie streamed from youtube on your website :)

Improve the content of your website by both quality and quantity.Crack every other stone that is related to the keywords your site consists of.Put up promotional offers and use other tactics that will draw visitors to your site for example say you start a forum where you could hold interesting discussion on some really important topics.And the last thing be unique.There are numerous websites offering the same thing.You have to segregate yourself from those by being a bit unconventional yet charismatic.

Yes using promotion is a good strategy and it works. I also host forum on my website. The best way is to extract latest post and display it on main page..

Good, relevant content is what they came for first. Give it to them. The sales will come if you can interest your customers enough to make them want to buy.

I would say make the content hypnotic.. as in hypnotic writing by Joe Vitale.. Basically make it a softselling salesletter, but give the the product (the content) for free. Also make sure the visitors are targeted, because the more targeted they are, the more interested they will be.

Sincerely, Cody Goodman