The three Graphics DriverPacks are divided up based on target systems now instead of content. This may change in the future depending on user feedback.
Graphics_A: Mainstream ATI/Nvidia desktop/mobile. (A for Active)
Graphics_B: Business-level ATI/Nvidia/Matrox for workstations; ATI FireGL, Intel, Nvidia Quadro, Matrox Parhelia (B for Business)
Graphics_C: Catch-all for the bulk of other drivers such as SIS/Via/ etc. (C for Catch-all)
The Language Third Party DriverPack contains international language versions of some files within the three main packs, so you will get prompts to overwrite the English-only files with their multi-language counterparts.
We tossed around the idea of a fourth pack to handle all the outdated/derelict drivers but this idea was abandoned.
Graphics_D: Outdated or obsolete hardware such as 3dfx/older ATI/ etc. (D for Derelict/Dated)
It's possible that we'll bring about the creation of a single "Archive" DriverPack which would include REALLY old or abandoned drivers (LAN, Graphics, Sound, etc.) for old systems. Who knows.