Open Database of corporate entities. As of 2011-04-09 has information on 7,841,828 companies from around the world. Jurisdictions covered include:

• 41,292 Bermuda
• 3,886,733 United Kingdom
• 96,104 Gibraltar
• 105,640 Isle of Man
• 77,693 Iceland
• 60,827 Jersey
• 92,795 Luxembourg
• 2,188,873 Netherlands
• 97,653 Alaska (US)
• 197,798 District of Columbia (US)
• 996,420 Michigan (US)

There is good API access but currently but no bulk availablitity.

License

See . However, should note that most data in OpenCorporates is scraped from elsewhere so this license only covers the 'IP' that OpenCorporates has obtained as a result of their efforts (and license of original databases, e.g. Companies House in the UK, is unclear).