Microsites
When all you need is a one page website, either to act as an online business card or to target a "search phrase" then what you need is a "microsite".
They are the easiest type of sites to create, normally thay can be operational within a matter of hours.
Here are some examples of microsites that targeted particular keyphrases:
This site was created to catch traffic for the term/product "isgott", the main retail site was not appearing in the top 10 so it was easier to use www."the search term".co.uk to catch search traffic for this priority keyword. The site appeared in the top ten in google within 72 hours.
www.MooringEquipmentGuidelines.co.uk
The above domain was used to capture the maximum search clicks in google for the launch of the new eddition of "Mooring Euipment Guidelines".
Within 48 hours the domain was at #1 for its targetted search term.