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Where can I get info on the MySQL 5.5 issues? I'm considering upgrading from 5.1 to get the new InnoDB plugin...

Just in case you weren't already aware, you can use the InnoDB plugin in 5.1 http://dev.mysql.com/doc/innodb-plugin/1.0/en/index.html

I know benchmarks don't put this quite as fast as 5.5, but there are still possible gains to be made.

Pssst look at tokudb