AirDroid is a nice application which allows you to manage your Android device from a nice WebUI. Just install the app and it will show you the address you need to load up in your browser and even generate a password for you.
The app works fine in both tethered and client WiFi mode. The list of functions includes:
- filesystem browsing and editing
- contact browser
- media browser with upload and download features
Check out the app to learn all its features, its free and I sincerely hope it will stay free ;)