Help me tune my server a bit

[Mijae]

Hello, my server consists of a Dual Xenon irwingdale with 4gb of ram running Fedora Core6.

php 5.1.6-3.6.fc6
mysql 5.0.27-1.fc6

my.cnf looks like this:

# The MySQL server
[mysqld]
port = 3306
socket = /var/lib/mysql/mysql.sock
skip-locking
key_buffer = 64M
max_allowed_packet = 1M
table_cache = 30000
sort_buffer_size = 1M
read_buffer_size = 8M
read_rnd_buffer_size = 4M
myisam_sort_buffer_size = 64M
thread_cache_size = 8
query_cache_size= 128M
max_heap_table_size = 384M
open_files_limit = 65535
long_query_time = 5
tmp_table_size = 384M
max_connections = 150
# Try number of CPU's*2 for thread_concurrency
thread_concurrency = 8

The site is getting about 12000 unique visits per day, with around 100k page views per day. What can I do to speed it up?

[Speeple]

What table types do you use? MyISAM, InnoDB?

What kind of free memory are you seeing at the moment?