There Are Two Ways to Add a SideBar to Your Article:

1. Using a Tag: Once you create the sidebar, you'll see a tag next to the sidebar's name. Copy the tag and place it anywhere on your article. The tag will be replaced by the sidebar. The syntax of the SideBar is: {sidebar id=x}, replace the x with the id of this SideBar. You can also place the SideBar on the left by adding align=left to the tag, like this:  {sidebar id=x align=left}
2. Automatic SideBar: Add your sidebar automatically to all the articles of a selected category. Read more about this feature here.

Yes, you can automatically show a sidebar on articles in any category you want. You can even place them in more than one category. For example, to show a Google AdSense sidebar on all your news content, simply choose your news category. The AdSense sidebar will automatically be displayed on all the articles in that category. You can also choose to show the sidebar in the intro text, in the full text or at the end of the article.

Read more about Automatic SideBars here.

Yes, you can add as many sidebars as you want to your articles and place them in any position you choose. Simply place the tag where you want the sidebar to appear.

Yes, the sidebar will align to the right by default, but you can have it align to the left by adding "align=left" to the tag. For example {sidebar id=x align=left}.

The sidebar will automatically change on the article to reflect your new design.

Yes. By using a "Custom Sidebar," you can enter anything you want in the HTML editor, including images, text, links, promotions, etc.

Yes and it's even easier with the Joomla 1.7 version! Just create an Ad Agency zone SideBar and select the zone you want to display.For the Joomla 1.5 version, you'll have to create a module SideBar since each Ad Agency zone is also a kind of module.

Yes, iJoomla SideBars supports both K2 and Zoo articles. Read more about this feature here.