StatsDawg

This graph gives you a rough idea of how many queries are selects, versus updates, etc. Though this graph does not show a percentage (see the MySQL Statistics section for this), it does give a rough idea, and also shows how many queries in general are going through MySQL. This can be useful to determine, for instance, if you may be running into table locking issues, which can be a common problem with MyISAM tables.

Note that this graph tracks only SELECT, UPDATE, INSERT, or DELETE queries and does not include general MySQL questions (which you can view by looking at the MySQL Questions Graph)