The Kai Grand Sentinel was a bimonthly newsletter produced by Project Aon in PDF format and published on their website. It contained interesting bits of information about the Lone Wolf books and related subjects, and news on the project's progress in electronically publishing Joe Dever's work.
The newsletter was launched with a Jan/Feb issue in 2005, but eventually only ran for three issues. In 2007, the Kai Grand Sentinel was revived, but in a blog format instead.
Note that "Kai Grand Sentinel" is a Kai rank. Specifically it is three ranks above a Kai Grand Master, and is one rank below Kai Grand Defender: the rank at which Lone Wolf begins in the Grand Master Series.