Quickening is upgrading his server so the feed is down temporarily.
So if you go there and find an error 404, don't panic, the feed at quickening will be back soon. Maybe just a few hours, but could also be days, depending on the problems that need solving, but it will be back online for sure.
But he has a whole lot more there than just basic Zaurus apps (mostly Sharp compatible but others as well). His page on my site that talks about his great stuff is at