Octava Inc., specialists in HDMI solutions, announced the release of the 4×4 HDMI / Ethernet CAT5-6 Matrix Switch. The 4×4 HDMI Matrix Switch enables users to switch 4 multiple HD sources to 4 HD ...

Talking Points Niles is now shipping its award-winning CAT5 HDMI Baluns Niles HDMI CAT5 Baluns feature an intuitive design that enables faster, more reliable installations Niles HDMI CAT5 Baluns ...

Gefen’s EXT-HDMI 1.3-CAT5-ELR uses HDBaseT technology to extend the range of an HDMI connection to 330 feet using CAT5 cable.

The HDMI cables are Mediabridge "High Speed HDMI with Ethernet" cables, brand new from Amazon. They aren't very expensive, but as far as I can tell their specs are more than adequate.