This cheat gives you $1,000,000 to play with. In the main Budget dialog, enter the following sequence: While holding
R1: Choose, Cancel, Triangle, Square
While holding
L1: Choose, Cancel, Triangle, Square
While holding
R2: Choose, Cancel, Triangle, Square
While holding
L2: Choose, Square, Triangle, Cancel
Bond

Embezzlement cheat - This cheat sets all subsequent
bonds to 0% interest. Note: There is a risk to using
this—this could result in fines of up to $100,000.
In the Main Budget dialog, enter the following sequence:
While holding
Triangle: L1,L2,L1,L2,R2,R1,R2,R1

Free Tools cheat - Most (but not all) tools will be available at no cost to the user.

With the normal arrow cursor, select and cancel the tree tool.
Go to the status bar and do the following (making sure
the cursor stays within the status bar area) : UP, DOWN,
RIGHT, LEFT, UP, ACCEPT

Maximum Dispatch cheat - Use of any of the dispatch tools (Fire, Police, Military) will yield the maximum number allowable within SimCity regardless of the number of stations you have.

With the normal arrow cursor, select and cancel the dispatch
tool. Go to the status bar and do the following (making
sure the cursor stays within the status bar area) : LEFT,
RIGHT, LEFT, RIGHT, CANCEL, ACCEPT

3D Game Chopper- Use this sequence to display a helicopter cockpit: R2-L2-R2-L2-R2-L2
To turn off the cockpit display: R1-L1-R1-L1-R1-L1
Fly, Be Free!

R-L-R-L-R-L2-R2-START-START
or R-L-R-L-R-L2-R2-X-X
One more Start or X puts you back into drive-through.
This cheat allows you to fly around the city without being constrained to the roads as normal. The controls in this mode are:
R1 Altitude Up
R2 Altitude Down
L1 Propel Forward
L2 Propel Backward
Up Look Up
Down Look Down
L Turn Left
R Turn Right

City Nights – Use this sequence to cycle night and day:
Down-Up-Down-Up-Down-L2-R2
Shut off with Down-Down-Up-Up-Down-Down-L2-R2
Fade To Black – Use this sequence to fades everything to black:
Down-Down-Down-Down-Down-Down-L2-R2
To pause the fade enter: L-L-L-L-L-L-L2-R2
Back to normal with: R-R-R-R-R-R-L2-R2

Rand McNalley – Use this sequence to bring up a translucent city
map HUD with position indicator: R1-R2-R1-R2-R1-R2-R1-R2
Lose the HUD with: L1-L2-L1-L2-L1-L2-L1-L2

Nugget Grab Cheat – Use this sequence to bring up a trail of golden nuggets on the road. Collect these nuggets as you move around the city and increase your city fund!
Bring up the Chopper cheat 8 times (do this by turning it on then off, leaving it on the 8th time), then the following sequence:
L2-R1-L2-R1-L2-R1-L2-R1