Mark Rittman's Oracle Weblog points me to a free web-based service from OraPerf that analyzes uploaded STATSPACK report files and provides a web report, highlighting areas that are of concern and offering advice on what parts of the database to tune first. The standard service provides a set of recommendations based on the contents of the STATSPACK report, but if you register (which is free) you get a far more detailed report, explaining what each of the STATSPACK statistics mean and giving you some idea of the figures you should be aiming at.
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Oraperf analyzes your statspack reports
statspack interest