SAS originally was initials of Statistic Analysis System. But now the No.9 nationally ranked private software company insists that SAS is a trade mark for their products, not initials any more. They claimed that SAS system is an integrated system of software providing complete control over data access, management, analysis, and presentation. In addition to understand it, an interesting article "What is SAS"is worth to read.
In about a decade, SAS became a very popular data warehousing system in nearly every data processing area such as pharmaceutical, banking, health industry,insurance etc. There is a big user group called "SAS Users GroupInternational (SUGI) which consists at least 5000 users. Its conferece is held every year and has more and more attendent.
Following are some very helpful SAS sources form internet.
SAS general information
Sample programs & macros
My favorate personal homepage about SAS: