Skydrive is Windows Live-based and can be used through the web browser:
The service offers 25 GB of free personal storage, with individual files limited to 100 MB. The service is built using HTML5 technologies, however, a Silverlight-based tool can be installed to allow drag-and-drop uploading from any Silverlight enabled browser such as Windows Explorer on a Windows machine or Safari on a Apple Macintosh computer. Up to five files can be uploaded each time if the tool has not been installed.
Right now the API uses WebDAV and it can browse or download files. There will be more functionality once the REST API is out of beta. Here is the download at CodePlex.