Spreadsheet entry jobs fall under the data entry category, and they are most sought after jobs for people who want to keep themselves busy while they wait for a preferred job. The reason these jobs are popular is because they require basic computer skills; and if you need to do the job from home, all you need is a computer, Internet connection and a good typing speed.
Companies will hire you when they have a lot of information that they need inputted into spreadsheets, and sorted in a particular manner. Many times, this includes information typed on paper and scanned into JPEG, or using online forms. When companies have a lot of data to input into spreadsheets or a database, they will outsource the job, but often times this is a short-lived job. However, you may find recruitment and staffing who will hire you for the long-term; in many cases, when your contract ends, the staffing agency will find you another job quickly.