These seem to be most of the interesting past threads? Additions welcome:

QEMU Internals - https://news.ycombinator.com/item?id=26941744 - April 2021 (33 comments)

Show HN: QEMU front end for M1 and Intel Macs - https://news.ycombinator.com/item?id=26260390 - Feb 2021 (122 comments)

How to run FreeBSD 13 in QEMU on Apple Silicon Mac - https://news.ycombinator.com/item?id=26053983 - Feb 2021 (39 comments)

QEMU Advent Calendar 2020 - https://news.ycombinator.com/item?id=25262608 - Dec 2020 (30 comments)

Changed-block tracking and differential backups in QEMU - https://news.ycombinator.com/item?id=25189078 - Nov 2020 (5 comments)

Booting a macOS Apple Silicon Kernel in QEMU - https://news.ycombinator.com/item?id=25064593 - Nov 2020 (70 comments)

QEMU 680x0 support [video] - https://news.ycombinator.com/item?id=25027213 - Nov 2020 (13 comments)

QEMU should move from C to Rust - https://news.ycombinator.com/item?id=24133128 - Aug 2020 (209 comments) (god help us)

macOS in QEMU in Docker - https://news.ycombinator.com/item?id=23419101 - June 2020 (186 comments)

Xnu-QEMU-Arm64: iOS on QEMU - https://news.ycombinator.com/item?id=22870905 - April 2020 (34 comments)

QEMU for iOS - https://news.ycombinator.com/item?id=22385370 - Feb 2020 (145 comments)

QEMU VM Escape - https://news.ycombinator.com/item?id=20796446 - Aug 2019 (57 comments)

QEMU 4.1 released - https://news.ycombinator.com/item?id=20713932 - Aug 2019 (14 comments)

QEMU v4.0.0 released - https://news.ycombinator.com/item?id=19736309 - April 2019 (159 comments)

QEMU Advent Calendar: A surprise disk image each day until Christmas - https://news.ycombinator.com/item?id=18588043 - Dec 2018 (34 comments)

Emulate Mac OS 9 with QEMU - https://news.ycombinator.com/item?id=18585157 - Dec 2018 (64 comments)

From VNC to reverse shell - https://news.ycombinator.com/item?id=18051264 - Sept 2018 (9 comments)

Osx-kvm: Run macOS on QEMU/KVM - https://news.ycombinator.com/item?id=17763855 - Aug 2018 (106 comments)

Almost booting an iOS kernel in QEMU - https://news.ycombinator.com/item?id=17544689 - July 2018 (19 comments)

Running Amiga-like OSes on QEMU - https://news.ycombinator.com/item?id=17531490 - July 2018 (12 comments)

Accelerating QEMU on Windows with HAXM - https://news.ycombinator.com/item?id=15759080 - Nov 2017 (24 comments)

VM Escape: QEMU Case Study - https://news.ycombinator.com/item?id=14218600 - April 2017 (44 comments)

QEMU: user-to-root privesc inside VM via bad translation caching - https://news.ycombinator.com/item?id=13928675 - March 2017 (28 comments)

Multi-threaded emulation for QEMU - https://news.ycombinator.com/item?id=13759283 - Feb 2017 (9 comments)

QEMU: virtfs permits guest to access entire host filesystem - https://news.ycombinator.com/item?id=13753950 - Feb 2017 (43 comments)

QEMU Advent Calendar - https://news.ycombinator.com/item?id=13118291 - Dec 2016 (37 comments)

OS X-KVM: Running Mac OS X El Capitan on KVM and QEMU - https://news.ycombinator.com/item?id=12556609 - Sept 2016 (89 comments)

Announcing qboot, a minimal x86 firmware for QEMU - https://news.ycombinator.com/item?id=9585631 - May 2015 (43 comments)

QEMU Advent Calendar 2014 - https://news.ycombinator.com/item?id=8712998 - Dec 2014 (16 comments)

QEMU 2.0.0 Released - https://news.ycombinator.com/item?id=7604916 - April 2014 (74 comments)

Virgil3D - a virtual 3D GPU for qemu - https://news.ycombinator.com/item?id=7042299 - Jan 2014 (1 comment)

QEMU 1.7.0 is now available - https://news.ycombinator.com/item?id=6883988 - Dec 2013 (16 comments)

QEMU 1.6.0 is now available - https://news.ycombinator.com/item?id=6220565 - Aug 2013 (18 comments)

QEMU 1.4.0 released with 95% of native IO performance - https://news.ycombinator.com/item?id=5231545 - Feb 2013 (51 comments)

QEMU 1.0 released - https://news.ycombinator.com/item?id=3303958 - Dec 2011 (19 comments)

Qemu + KVM is the future of open source virtualization - https://news.ycombinator.com/item?id=1226598 - March 2010 (2 comments)