Advantages of 64-bitness for LAMP applications?

[Ted Roche]

I have a fundamental question on the advantages of 64-bit CPU systems 
for current Linux-Apache-MySQL/PostGreSQL-PHP/Perl/Python applications. 
Is there a price/performance advantage, and if so, where are the 
benefits?

Most of the  work I've been doing is fairly low-traffic data-driven web 
sites or direct access to a database server. Do the 64-processors 
provide any advantages in these situations, or should I just stick with 
32-bit processors? I can see where a 64-bit machine might have 
advantages in heavy number crunching or ray-tracing, or in other 
high-performance situations where the software's been tuned for it, but 
that's not where I'm concentrating.

Comments welcomed.

Ted Roche
Ted Roche & Associates, LLC
http://www.tedroche.com