Announced today, Epocware have launched HandyBase, a dedicated database application for the P800. We've had the beta under long term test at AAS, so expect a review in the next week. In the meantime, you can find more details on the Epocware website.
Included in the package is Handy Base Converter for your PC, which allows you to convert common PC database files to Handy Base for Sony Ericsson P800 databases and visa versa. The following PC database file types are supported: CSV, Text, MS Excel, MS Access, MS SQL, DBF, My SQL, Oracle and other files.