List subcategories on main pages?

I dont know if this can be done or not, but can someone tell me how to list the sub categories underneath my main categories on the main pages? For instance, instead if one of my users clicks on Kitchenware, the next page they get has categories of Small Appliances, Gadgets, Dinnerware, etc. with even more subcategories under those requiring the users to keep clicking through more and more pages to find what they want. I'd like to make it look like:

Small Appliances
Coffee
Mixers
Blenders

Dinnerware
White
Colors

Gadgets
Vegetable tools
Timers

etc.. whereas if they are at the main kitchenware page and want to look at blenders, they can just click on blenders instead of now having to click on appliances to get to one page and then click on blenders to get to the product listing pages. I want them to be listed all on one page in a tree-like format..I guess similar to what Amazon.com has. Is this possible? And can someone explain how to do it? Thanks!