Passports issued prior to October 26, 2005 do not require visas for tourist travel staying less than 90 days, however if your passport was issued after October 26, 2005 but is not biometric, you will need a visa for tourist travel regardless of the length of stay.
Another option is to obtain a green card however the process is fastidious and time consuming and is not always successful. Outlined below are suggestions on how to proceed.
Green cards are valid for 10 years and you will be taxed as an American citizen. You will need to declare international revenus in the US even, which may prove to be an expensive endevor for those only residing in the US for a short while.
Update 13/06/2008
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