Bitcoin directory categories

Hi users.

I'm into my BTC project of developing a directory for bitcoin-related sites. It's coded from scratch, not using pre made directory scripts. This is because most directory scripts IMO are cluttered and spammy with no quality control and cluttered with adverts. The whole site will be based on helping bitcoin users find a specific bitcoin related service with just a few clicks. Users will also be able to directly +1 a website if they trust it and help the community.

The directory will have a x master categories with x sub-categories.

ex:
master->[Shopping Sites]
sub->Electronics
sub->Virtual

etc...

This is probably the most important part of the site. It will help users find sites with ease.

I need your input on what the master categories should be, there should be no more than 10 master categories, should be easy to find and cover all types of BTCwebsites. If you can help define the categories that would be excellent.

As a thank-you, you will be mentioned on the credits page for defining the categories (I know it's not much but hey!).

Cheers.