Zoho

Zoho is a applications site with multiple uses.  Users can easily create documents, spreadsheets, presentations, planning tools, forms and databases, wikis, and conferencing tools.  The free version is quite robust while the pay version allows for more management options.

YouTube

YouTube is a video sharing site, which allows for users to share their video thoughts online.  Through tagging and easily embeddable players, this application has revolutionized the online video experience.

Wufoo

Wufoo is an easy to use HTML form creator.  For those without the ability to create a database system for keeping data, Wufoo builds the database according to your form.

Wikipedia

Wikipedia is probably the most well known wiki site hands down.  Familiarity with this tool and the process of editorial control and article vetting, is a skill many may find useful for future online creation.

Wetpaint

Wetpaint is a hosted wiki tool designed to allow easy management and editing of your own created content.  Though the amount of visual noise encountered by the free-account related adds found on the finished page may seem bothersome, the ability to easily keep a wiki without requiring a large amount of coding knowledge may be useful to novice creators.

Thumbstacks

Thumbstacks is an online presentation maker.  Although still not as robust as other editors, the drag and drop interface, which supports Rich Text, may be more comfortable for novice users.

Threadless

Threadless is a Tshirt design site, made to allow graphic designers a place to share their creations.

Stikipad

Stikipad is a hosted wiki system which features many enhanced capabilities and multiple levels of management, depending on account type.

podOmatic

podOmatic  allows users to create, share, and find podcasts.

Picnik

Picnik is an online photo editor that works smoothly with most other online photo sharing applications.  You can upload your collections from such sites as Flickr, edit the photos, and then share them in many ways.  You can even make easily embeddable slide shows for highlighting your photographic talents.