I'm currently learning what this Big Data specifically using Apache's Hadoop is all about and I can say its a a Big WOW just by imagining how much data it can process. If you're an IT guys like me that has Database administration background using MS-SQL, MySQL, Oracle, etc, you would ask how those all the data (syslog, weblog, sales, etc.) can be imported to a database and make use of it or produce information that can help the business or customers.
Big Data can use or import using Pig (can eat anything) or if you're not much of a java programmer, a Hive can be use to create a MapReduce jobs. There are also tools like Sqoop and Flume that can help importing file or streaming data.
Good thing also about Hadoop is that the License is under Apache, which means no one OWNS it and the public community can use it, for Free.
Link:
http://hadoop.apache.org
