Question: RAM is getting cheaper every day. Researchers are announcing major 
breakthroughs in memory technology. Even today, servers with multi-gigabyte 
RAM are commonplace. For many systems, it's already feasible to keep all 
business objects in RAM. Why can't I simply do that and forget all the 
database hassle?

Answer: You can, actually.

http://www.advogato.org/article/398.html

http://www.prevayler.org/wiki/

Is it safe? Do you know it? What do you think about?

Thank you