R6RS Chez Scheme 7.4D and TSPL4 Now Available

A R6RS conformant Chez Scheme 7.4D and TSPL4 now available.
Surprised?! I was. I hadn’t heard anything either. Anywhere. From anyone.
Yesterday though, I saw Aaron (dedicated Chez user) posting about R6RS ports here and Eduardo mentioned TSPL4’s availability here here.
Addendum: 08/04/09
The TSPL4 link is broken, but was not at the time of posting. Since the hardcopy hasn’t been released yet, I suspect that the link will be down until the hard copy is released.
Addendum: 08/08/09
The link is back up.
FWIW: I didn’t think it was worth bothering Kent by asking about why it was down in the first place.