SAS Publishing just came out with a nice and nifty 28 page pdf document “ Coming To SAS FROM SPSS – A programming approach” Its a nice read, very useful for people curious or willing to try SAS after learning SPSS, and very well written by Susan J Slaughter and Lora D , who have written “The Little SAS Book” , one of the most popular SAS handbooks ever written.
You can download it or plainly read it from
http://support.sas.com/publishing/bbu/companion_site/62272.pdf
SPSS of course has very nice menu driven setting, while SAS programmers generally prefer the scripting way of writing code- they do have menus in various products.
DECISION STATS 
SAS or SPSS
Overall Functionality: SAS provides better access to specialized and multivariate procedures
Platforms: SAS has more programming power in its base language. SPSS for windows provides a powerful, and unrelated, scripting language. SAS can be used across platforms (Connect & Share). SPSS cannot provide this. SAS seems to have better data base connectivity. Both offer warehousing products. The product from SAS is award winning.
SPSS has a book, Programming and Data Management for SPSS Statistics 17.0: A Guide for SPSS Statistics and SAS Users that has been updated annually for about five years. It can be downloaded as a PDF file from
http://www.spss.com/devcentral.
Besides a wealth of information on, well, programming and data management with SPSS Statistics, it includes a 35-page chapter entitled
SPSS Statistics for SAS Programmers.