Magento MySQL my.cnf perfect setup

Here is my ever evolving my.cnf file for a Magento install. If anyone has anything to add please comment, I will add it to my script and test!

[mysqld]
datadir=/var/lib/mysql
socket=/var/lib/mysql/mysql.sock
user=mysql

#innodb settings
innodb_log_file_size=100M
innodb_additional_mem_pool_size=20M
innodb_flush_log_at_trx_commit=2
innodb_lock_wait_timeout=1800
innodb_buffer_pool_size=20G 

#other vars
net_read_timeout=120
skip-locking
skip-name-resolve
table_cache=2048
thread_cache_size=16
back_log=100
max_connect_errors=10000
open-files-limit=20000
interactive_timeout=3600
wait_timeout=1800
max_connections=200
key_buffer_size=1G
connect_timeout=120

#skip-name-resolve
max_allowed_packet=16M
tmp_table_size=64M
max_heap_table_size=64M
query_cache_size=256M
sort_buffer_size=1M
read_buffer_size=1M
read_rnd_buffer_size=8M
join_buffer_size=3M

old_passwords=1