DBI is Ruby 1.9p1 compatible in the development branch of the git repository; the majority of changes revolve around the test suite, not the application (however, there is a critical problem with DBI::Row in 0.4.0 that will render the whole package inoperable in 1.8). This will be released as DBI 0.4.1 once the test suite is stable again.

There were new MySQL/Pg DBDs released today that deal with issues surrounding Numeric/Decimal types.