Virtual MIDI cable LoopBe1 connects One Man Band with software synthesizers and other MIDI Software.
The PSR Tutorial Webside maintained by Joe Waters provides free Gig Disks with styles for specific songs.
At Jörgen Sörensons Unofficial YAMAHA Keyboard Resource Site you will find links and info to anything related with Yamaha styles.
A large collections of styles at Styly SFF.
The largest auto-accompaniment forum in the world is Bob Gelmans Yamaha PSR styles at Yahoo. Linked to this forum is the Vault or Spectromagic archive where Yamaha versions are available converted from all other keyboard types.