Browse or mount SD card over WiFi on Linux?
WiFi File Explorer allows browsing of the SD card through a web based interface. Quite nice, but perhaps difficult to copy a large number of files.

http://lifehacker.com/5626268/wifi-file-explorer-manages-your-android-sd-card-from-a-web-browser

On Air (Wifi Disk) 'allows you to easily transfer files over your Wi-Fi connection by accessing it as if it were a drive', but only for Mac I suppose.

SwiFTP is an FTP server, which does what it says.