Dual pentium pro's? 192Megs RAM?! Good greif, man! You can run what ever the hell you want!
Anything over a 100mhz pentium and 32megs of RAM is would make a good linux workstation, if you don't mind sacrificing some nice GUI features...
Literially, a machine that powerfull will run a file server or static webserver for a medium sized company without even breaking a sweat. I always wanted to get my hands on one of those dual pentium pros.
Of course your main limitating factor in this bad boy is graphics ability, lots of anti-aliases text/images, cartoony icons, and special effects require a nice video card. So avoid getting to much eye candy. For instance if you picked Redhat 9.1, don't use kde or gnome as your default desktop. Use something small like IceWM and you'll be fine.
With such a massive harddrive this would make a great fileserver for you home network. installing and configuring Samba to file share with windows would be a moderiately difficult, but good learning experiance.
This is GREAT hardware for learning linux on, you may have to go thru a few extra steps to get everything configured and setup because it may have some unusual componates that may not be common amoung home users. But once it gets going, you can go ahead and unplug the monitor and keyboard and it will run months without even so much as a peep.
good luck!
(I have a old prolient server I got from my dad's company when they upgraded. It had a 486, but I installed a pentium overdrive chip for 86mhz, and added some RAM for a total of 96megs. It has some scsi drives (whoho) on it. I ran a nfs/apache/ftp/samba/ssh plus a few other services running on it, and it handled it without any problems. Actually when accessing it only had a slight laggy fealing that betrayed it's age, but in every other aspect (and once the connection was made) it ran as well as any modern kit)