You can set any size for a sidebar (read more about sizes). Sidebars can be specified, for the whole site, for each category or page type, or individually for each page / post. You can create as many sidebar as you wish. There are 6 different layouts to use:
[columns] [column width=”1/3″]Right sidebar
Left sidebar
2 sidebars
2 right sidebars
2 left sidebars
No sidebars
