Government

HMRC information on taxes and VAT
Companies House    information on all limited companies and limited liability partnerships
National Statistics    Everything you need to know about the UK economy
DTI     Information for industry
DirectGov    Information on public services
Scottish Parliament  Information on Scottish government
Scottish Enterprise   Information on sources of finance and business support

Banks and financial information   

Bank of Scotland 
Royal Bank of Scotland

Currency rates

Software

Excel add ins   one of the best sites we have found for time saving Excel add-ins
Microsoft
Active Words  a great little program that helps you remember anything you want

Mindjet an intuitive tool that helps you control and find anything