A quid is a slang term for the British pound. So currently, 1000 quid (or 1000 pounds) is about $1500 US dollars.
Sidebar is a theme feature introduced with Version 2.2. It's basically a vertical column provided by a theme for displaying information other than the main content of the web page. Themes usually provide at least one sidebar at the left or right of the content.
The Sidebar has its own search box and finds applications, which can be launched directly from the results list that appears as words are typed in. The Razz: Tech Heads: Google eyes your desktop