One use can be to read BIG PDFs on the IPT.
You can put them into the Library/WebServer/Documents/ folder, then point Safari to Apache by entering the IP address of your IPT, just like
http://192.168.1.100/mydoc.pdf
HOWEVER, be warned I tried it with a 8.5MB PDF, and it severely impacted my IPT. I had to reload the OS through iTunes, then go again through the jailbreak process.
I got a "low memory" error when dropping the PDF into that folder, but ignored it. Safari opened the file perfectly, but next time I restarted the IPT, the Springboard screen was blank (just the icons on the top row)... More to investigate