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 Windows Gadget Platform/Sidebar is available for use in the following versions of Windows: Windows 7, Windows Vista, and Windows Server 2008. It may be altered or unavailable in subsequent versions. This topic introduces the Windows Gadget Platform.