Other areas of possible interest are http://www.pc.ibm.com/listfiles.html (list "PowerPC Files" by name or date) and ftp://ftp.austin.ibm.com which contains a bunch of random PPC files & info.

This listing is from ftp://ftp.pc.ibm.com/pub/pccbbs/allfiles.txt on 2/1/00

PowerPC Files
/pub/pccbbs/powerpc
----------------------------------------------------------------------------
3comenet.exe    48684 09-07-95  3COM ISA Ethernet adapter diag file 
7248_110.exe  1009440 10-30-96  PowerPC Firmware/SMS v1.10 for 43P 
aix3cisa.dd   1474560 10-02-95  AIX drivers for 3COM ISA cards, dd formt 
arc146.trz     235571 05-05-95  Arc 1.46 for AIX. compressed and tar'd 
arc148.dd     1474560 10-02-95  Windows NT ARC 1.48 in UNIX dd format 
arc148.exe     290616 08-03-95  Windows NT Arc Bootloader v1.48 
arc149.exe     327200 11-13-95  Windows NT ARC Bootloader v1.49 
arc150.dd     1474560 10-30-96  PowerPC ARC Boot Disk 1.50 Unix DD Image 
arc150.exe     389440 04-10-96  ARC v1.50 for PowerPC computers 
arc151.dd     1474560 10-30-96  PowerPC ARC Boot Disk 1.51 Unix DD Image 
arc151.exe     390480 10-30-96  PowerPC ARC Boot Diskette v1.51 
arcv146.exe    228455 03-07-95  Windows NT ARC Bootloader version 1.46 
eth_conf.exe    48428 04-08-96  NE2000 Ethernet software configuration 
ibmpc28.tar     20480 03-19-96  AIX 4.1.4 Script-IBM PCMCIA 28.8 Modem 
ientdd.bin      32492 02-27-95  ISA ethernt drvr for AIXv4.2.1.1+ (mltct 
ientdd.txt        500 02-28-95  README for IENTDD.BIN 
nt40ppcs.exe   116800 04-10-96  Windows NT 4.0 Beta PPC Sound Drivers 
ntsp2ppc.txt     5166 11-13-95  NT ServicePak 2 Installation Instruction 
p4x0_128.exe   812223 09-28-95  440 1.28 SMS/firmware update 
p8x0_106.exe  1068320 09-01-95  830/850 1.06 firmware update 
p8x0_106.trz  1403677 09-01-95  830/850 1.06 firmware, tar/compress 
p8x0_107.exe  1096684 12-05-95  PowerSeries 830/850 SMS/ROS v1.07 
p8x0_108.exe  1078560 01-12-96  Power Series 830/850 Firmware Upt v1.08 
p8x0_110.exe  1075840 10-30-96  PowerPC Firmware/SMS v1.10 for 830/850 
perfwp.exe     297493 10-09-95  Power Series 800 Performance Paper, PS 
ros104.exe     931185 06-20-95  830/850 ROS 1.04 image only 
sms102.exe    1448323 07-01-95  830/850 SMS 1.02 
sms126.dd     1474560 03-21-95  AIX dd image of 440 SMS 1.26 
sms126.exe     756958 02-16-95  440 SMS 1.26 
sms127.exe     763860 07-22-95  440 SMS 1.27