If you have the razor claws you can climb walls by crouching in front of one and doing a high jump then pressing O at the top of the jump to attack the wall, and before you fall back down do another high jump in mid air. Just keep repeating this and you can get pretty far before running out of ammo. Some pretty awesome glitches with this, but the rest is up to you. Good luck.

On any level of the game fall and spin while useing the thruster pack around and around and you will fall quicker and it's like in side a wheel

During your second playthrough (on Challenge Mode), you can purchase an item called the Golden Groovitron for 2,000,000 Raritanium.

Greetings inferior beings of Polaris. In the Clank section of the IRIS, on Kreeli Comet, You can find a secret hexagonal space just after the VERY first Zoni charge-up area. Standing on the space causes a Gagetron Helpdesk message to appear, and it gives you a code. Please note, this code is for the upcoming PSP game, Secret Agent Clank. The code is: left, left, right, up, down, down, X.