Goomeo lets you share your files with other people using wifi (direct phone to phone) so you can share contacts, MP3â€™s, playlists, podcasts, videos, pics and other files. It also has a chat feature that lets you text message or voice message (like a walkie talkie) also using wifi over WIFI, which has a 100 m range in free air. Through Goomeo you can also update your facebook status or tweet and you can provide your location and a meeting point.
The app is cross platform, but there is an alpha release out for Windows Mobile at present.
Try the app here and let us know how well it works.