MySQL
MySQL
Useful scripts
Replication
MySQL tunning
MySQL Error Codes
MySQL backup
SQL Optimization
Securing MySQL
custer-data-tables
elsewhere
How To Set Up A Load-Balanced MySQL Cluster With MySQL 5.1
Sundry MySQL Scripts and Docs
Mysqltuner
Converting 4.0 Character Columns to 4.1 Format
MySQL Forge Wiki
Zmanda Open Source backup
Zmanda Wiki
InnoDB hot backup
Percona adds enhancements to the MySQL server code and releases these as Percona-built server binaries, with significantly more functionality than MySQL