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.
All Gmail users can now use the Insightly Sidebar. The Sidebar is a Chrome browser extension and is not restricted to Google Apps accounts. The Sidebar will eventually replace the Gmail Gadget. Recording and actioning email messages in an efficient and productive way is a big part of Insightly.