http://www.snsys.com/ps3/prodg.asp

The Debugger for PlayStation®3 is an evolution of the SN Systems Debugger which is in use on current generation consoles. The Debugger allows you to view source code, disassembly, memory, registers, variables, processes/threads, TTY and the call stack. A split-pane system allows unlimited configuration of pane layout. Projects allow persistence of settings specific to each ELF. The Debugger provides comprehensive support for PPU and SPU registers, memory, instructions and opcodes.

SN Systems' Tuner, developed specifically for the PlayStation®3 architecture, lets you capture and visualize program behavior so that you can eliminate conflicts and bottlenecks and cache misses in your code. Tuner runs completely in software - no special hardware required. High performance games can now be achieved with less guesswork. Tuner gives you the following features

Target Manager
Load and run executable files
TTY view
Fileserving provides the target with access to the host file system
Manages connections to multiple development hardware on your network allowing simultaneous debug sessions or sharing of development hardware
Color-coded display of printf streams
Target Manager SDK provides programmatic access to the functionality of Target Manager