Optimal Settings (web, Databse, Security)

I have the following config:

Centos 4.7 Final
Apache 2.2
PHP 5.2.9 (suphp / suhosin disabled)
MySQL 5
Server: Dual Xeon, 4GB Memory

I'd like input on the most optimal settings overall

php.ini

Quote:

; Memcache Section
extension = memcache.so
memcache.allow_failover = 0

extension="eaccelerator.so"
eaccelerator.shm_size="16"
eaccelerator.cache_dir="/tmp/eaccelerator"
eaccelerator.enable="1"
eaccelerator.optimizer="1"
eaccelerator.check_mtime="1"
eaccelerator.debug="0"
eaccelerator.filter=""
eaccelerator.shm_max="0"
eaccelerator.shm_ttl="0"
eaccelerator.shm_prune_period="0"
eaccelerator.shm_only="0"
eaccelerator.compress="1"
eaccelerator.compress_level="9"

;;;;;;;;;;;;;;;;;;;
; Resource Limits ;
;;;;;;;;;;;;;;;;;;;

max_execution_time = 300
max_input_time = 600
memory_limit = 256M

httpd.conf

Quote:

RLimitMEM 473331029
RLimitCPU 240
ErrorLog logs/error_log
DefaultType text/plain
AddType text/html .shtml

ServerLimit 1000
KeepAlive On
MaxKeepAliveRequests 64
KeepAliveTimeout 1
MinSpareServers 5
MaxSpareServers 15
StartServers 30
MaxClients 850
MaxRequestsPerChild 64
HostnameLookups Off
UseCanonicalName Off

my.cnf

Quote:

[mysqld]
local-infile=0
datadir=/var/lib/mysql
skip-locking
skip-networking
safe-show-database
query_cache_limit=2M
query_cache_size=128M ## 32MB for every 1GB of RAM
query_cache_type=1
max_user_connections=350
max_connections=600
interactive_timeout=10
wait_timeout=28800
connect_timeout=20
thread_cache_size=128
key_buffer=512M ## 128MB for every 1GB of RAM
join_buffer=8M
max_connect_errors=20
max_allowed_packet=32M
table_cache=1024
record_buffer=8M
sort_buffer_size=4M ## 1MB for every 1GB of RAM
read_buffer_size=4M ## 1MB for every 1GB of RAM
read_rnd_buffer_size=4M ## 1MB for every 1GB of RAM
thread_concurrency=8 ## Number of CPUs x 2
myisam_sort_buffer_size=64M
server-id=1
collation-server=latin1_swedish_ci

[mysql.server]
user=mysql
old-passwords = 1

[safe_mysqld]
err-log=/var/log/mysqld.log
pid-file=/var/lib/mysql/mysql.pid
open_files_limit=8192