It's been way too long since I played with this stuff, but here's a new release of mod_speedyfeed.
The primary changes are to fix a bug Kellan (of laughingmeme.org) found with the If-Modified-Since support. It didn't work when you sent multiple fragments in your If-Modified-Since header, and quotes around the If-Modified-Since value would confuse it. I'm not sure if the quotes are really legal, but supporting them was trivial once I had the code to fix the first problem, so now quoting the value works.
There are also some fixes to the tests on systems with older Apache::Test installs or versions of Apache that don't include atom in their default mime.types file.
Get it while it's hot, at the usual place.