The answer to it really depends on what you do right now and what are your future goals.
My advice - be as generic as you can. Don't invest 100% in one technology. If you're interested in DW, keep an eye out for SAP, SAS, Informatica and other ERP/B.I/ETL tools, since the ultimate purpose of a DW is to enable some sort of analysis/prediction.
Join some consulting company like Deloitte or Accenture and over a period of time, you should try to gain exposure to a variety of technologies.
To get an idea of DW market in USA, you can search monster.com, dice.com etc. All the best! Amit [ December 09, 2006: Message edited by: Amit Saini ]
The whole ETL process would represent DW i guess. Look up the internet for DW tutorials. Here is a link to a good DW or DM tutorial. I found it to be concise and to the point. It might not help you design your own data mart any time soon but you can grasp the over all picture.