Although I've known for a while that it was possible to build the HTTP Server docs as PDF, I never really bothered to find out how. Finally this afternoon I was poking around and figured out how. The latest docs are available in PDF format here, and I'll try to keep them somewhat fresh, if you want to bookmark that.
Apache HTTPd 2.0 docs (pdf - 3Mb)
Apache HTTPd 2.2 docs (pdf - 4Mb)
Apache HTTPd 2.3 (trunk) docs (pdf - 4Mb)
Neat!
I wonder how hard it would be for the PDF version to note links to the glossary somehow.