Lancer

Lancer is the codename for the highly-optimized Vorbis libraries and utilities by BlackSword of the Ogg Vorbis Acceleration Project.

The latest version, Lancer 20060506 (20060512 for MT versions), is based on aoTuV beta 4.51. It includes the accelerated versions of:

oggenc2.83
OggDropXPd 1.8.9
Vorbis dynamic link libraries (ogg.dll, vorbis.dll, vorbisenc.dll, vorbisfile.dll)
libvorbis.dll

Note that starting version 20060506, BlackSword now provides several versions of the Lancer suite, each optimized for a certain processor feature. Here's a quick run-down (not exhaustive!) of the versions:

SSE: AthlonXP (Barton core and older), Pentium III
SSE2: Athlon64, Opteron, Pentium IV
SSE2MT: Multi-threading version of SSE2
SSE3: Athlon64 Rev E (Venice & San Diego core), Pentium IV Prescott
SSE3MT: Multi-threading version of SSE3

Theoretically, the MT version should run faster on HyperThreading-capable processors or Multiprocessor systems.