Virtual Journals in Science and Technology Series
The Virtual Journals in Science and Technology series, co-published by the American Institute of Physics and the American Physical Society, has been around for many years. Currently, the series covers:
The Virtual Journals are "free topical alerting services that collect and organize papers from a broad range of sources, including Science and Nature." The publishers recently announced the release of a completely redesigned Website, which now includes RSS feeds. More information about the Virtual Journals service is available here.