Wikipedia has a dumbed-down explaination of IDA: http://en.wikipedia.org/wiki/Interactive_Disassembler
Obviously that doesn't help those new to IDA to dissect the PS3 files xorloser's plug-in handles, but (while we don't allow warez on the site) in the past Devs have posted some 'required files' here in the PS3 Dev section.
The Interactive Disassembler, more commonly known as simply IDA, is a commercial disassembler widely used for reverse engineering.
It supports a variety of executable formats for different processors and operating systems.
It also can be used as a debugger for Windows PE, Mac OS X Mach-O, and Linux ELF executables.
That being said, below is a link to IDA Pro v220.127.116.118 for those interested in examining it: