This is funny because a friend and I were having the exact same conversation recently. He started playing poker after a long hiatus, and was impressed with how much Poker Tracker had improved, and mentioned that it was so sophisticated now it came with an installation of PostgreSQL. I balked at this immediately, thinking there must be a better way than loading an entire PostgreSQL instance onto an end user's machine. I assumed that standalone applications that required RDBMS functionality would use an embeddable database system like Derby or SQLite. I'm most interested to hear from the developer what requirements led him to choose PostgreSQL over those alternatives. Anyone here have any thoughts?