If you are a US citizen, you will likely need to report your income to the IRS. If you have specific questions about your circumstances, I would recommend that you speak with an accountant. For tips and suggestions, read Tips for selecting an accountant

Do you mean Social Security Disability Insurance or Supplemental Income?Please clarify. Social Security Disability Insurance pays benefits to you and certain members of your family if you are 'insured,' meaning that you worked long enough and paid Social Security taxes. Supplemental Security Income pays benefits based on financial need According to the Social Security Administration, two factors can determine whether you are no longer disabled and stop your benefits: 1) Your disability benefits will stop if you work at a level considered 'substantial. In 2010, average earnings of $1,000 or more per month ($1,640 or more per month if you are blind) are usually considered substantial. 2) Your disability benefits also will stop if it is determined that your medical condition has improved to the point that you are no longer disabled. You are responsible for promptly reporting any improvement in your condition, if you return to work, and certain other events as long as you are receiving disability benefits. The booklet sent to you when your application was approved explains what you need to report to. There are special rules that help you keep your cash benefits and Medicare while you test your ability to work, called 'work incentives.' Work incentives include, but are not limited to, continued monthly benefits and Medicare coverage while you attempt to work on a full-time basis. For more information about Social Security work incentives, refer to Working While Disabled--How We Can Help.

If you make money on a regular basis from your web site, then it is considered a business and you need to pay taxes on the income. However, as a business, you can deduct your expenses (web hosting, etc.) from your income, thus reducing your tax liability. It is always better to do things properly rather than risk the IRS or Social Security coming after you in a few years and making your life miserable. Even passive income has to be reported to the IRS.