I just uploaded the first clickable version of the diagram of the MySQL 5.1. information_schema database. Its right here: http://www.xcdsql.org/MySQL/information_schema/5.1/MySQL_5_1_INFORMATION_SCHEMA.html.
Apart from adding the new information schema tables (PARTITIONS, FILES, PLUGINS, PROCESSLIST, ENGINES) I also touched up the layout, modified the pagesize (in the visio file; you can now print it on A3 without much hassle), and added a relationship between SCHEMATA and TRIGGERS.
I will be maintaining both the 5.0 and the 5.1 version of the diagram from now on.
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