[Bod]

Countries that drive on the left:

Anguilla
Antigua & Barbuda
Australia
Bahamas
Bangladesh
Barbados
Bermuda
Bhutan
Bophuthatswana
Botswana
British Virgin Islands
Brunei
Cayman Islands
Channel Islands
Ciskei
Cyprus
Dominica
Falkland Islands
Fiji
Grenada
Guyana
Hong Kong
India
Indonesia
Ireland
Jamaica
Japan
Kenya
Lesotho
Macau
Malawi
Malaysia
Malta
Mauritius
Montserrat
Mozambique
Namibia
Nepal
New Zealand
Pakistan
Papua New Guinea
St. Vincent & Grenadines
Seychelles
Sikkim
Singapore
Solomon Islands
Somalia
South Africa
Sri Lanka
St Kitts & Nevis
St. Helena
St. Lucia
Surinam
Swaziland
Tanzania
Thailand
Tonga
Trinidad & Tobago
Uganda
United Kingdom
US Virgin Islands
Venda
Zambia
Zimbabwe

Reason being because in ye olde days you carried your sword in the right hand and needed it handy lest the person you passed wanted a fight. Those that travel on the right tended to have been invaded by the left handed Napoleon.