Android only: Missing your USB cord, or just too lazy to grab it? WiFi File Explorer turns your Android SD card into a small web server, so you can transfer files, stream media and otherwise control your content across a Wi-Fi network.
The app's setup couldn't be more simple. Connect your Android to your home Wi-Fi network, then start the app. You'll get a popup box with the exact address you should point another browser to on the same Wi-Fi network toward. The app can run in the background when you press the Home key, or shut down when you hit Back or exit the app manually. The web file manager is spare but functional, and in the free version you can only download, not upload. Both apps could use a link for bulk downloading of multiple files, but for grabbing a few files here and there, it's fine and functional.
WiFi File Explorer has a free app, but the Pro version, with file upload and other functions, is £0.69 or about $US1. You can grab it in the Market using the QR code at right.