Here are all the known codes for the worldofcars.com from the Race-O-Rama toys:
NUM CAR NAME CODE ___
01 Lightning McQueen 6409-8493-5732-5580
02 Radiator Springs Lightning McQueen 9327-1174-4727-5660
03 Dirt Track Lightning McQueen 9470-9451-8505-0360
04 Cruisin' Lightning McQueen 9144-5571-4030-1910
05 Dinoco Lightning McQueen 5039-6459-7918-0930
06 Cactus Lightning McQueen 1518-6621-3930-7700
07 Bug Mouth Lightning McQueen 3351-7873-9717-2300
08 Bling Bling Lightning McQueen 1231-2950-1799-1210
09 Tongue Lightning McQueen 1024-4524-6744-9000
10 Fabulous Hudson Hornet 8480-1149-8386-0400
11 Doc Hudson 3540-7419-8147-2820
12 Yellow Ramone 4929-9302-9067-2920
13 Hydraulic Ramone
14 Ghostlight Ramone 8792-8056-8286-7760
15 Lightning Ramone
16 Purple Ramone
17 Green Ramone 7891-6444-4059-1330
18 Old School Ramone 5260-3267-0401-0360
19 Brand New Mater 8877-0035-8498-8410
20 Mater 1651-9258-0409-3480
21 Ferrari F430 5799-3352-7205-1390
22 Mario Andretti 1202-6435-8166-6050
23 Dale Earnhardt Jr. 1688-3460-5766-4600
24 Chick Hicks 8966-6092-7310-5860
25 Stacy (Leak Less Pitty) 6654-7781-2755-8520
26 Dinoco Chick Hicks 9924-7321-5237-2590
27 Dinoco Helicopter
28 Leroy Traffik 5389-2152-4584-2930
29 Tex Dinoco 7643-2102-7044-2060
30 Sarge
31 Kathy Copter 7301-1761-7547-5120
32 Petrol Pulaski (RPM Pitty)
33 Pit Crew Member Hudson Hornet 1111-0783-1774-2790
34 Pit Crew Member Guido 5007-7503-2723-3220
35 Lightning McQueen w/ Bumper Stickers
36 Spin Out Lightning McQueen 3739-9602-6488-0210
37 Pit Crew Member Fillmore 2827-5761-4459-8420
38 Fillmore 4122-3016-9167-7420
39 Hamm
40 Boost 8175-5751-3667-2700
41 RPM
42 Bob Cutlass 5853-7265-3976-0820
43 Darrell Cartrip 8513-0754-3087-7500
44 Fred
45 Yeti 2606-6194-9589-8480
46 Sheriff 7209-2716-7078-4800
47 The King 8998-3450-8216-0080
48 Sally
49 Leak Less 9589-8024-3699-6250
50 Nitroade
51 Lizzie
52 DJ
53 Wingo 8704-7651-2238-3830
54 Snot Rod 8159-2061-5149-6610
55 My Name's Not Chuck
56 Tow / "Race Tow Truck Tom" 9393-1090-0913-5510
57 Race Official Tom
58 Axel Accelerator 2289-2565-3966-1430
59 Chuki 8151-1226-6922-3690
60 Roman Dunes (No Stall Chief)
61 Van
62 Luke Pettlework (Dinoco Pitty) 1698-7387-2911-5570
63 Al Oft the Lightyear Blimp
64 Hugo Fast (Nitroade Pitty) 6162-9976-0248-5120
65 Charlie Checker 9148-1802-3890-2560
66 Tar Lightning McQueen 8079-1368-2702-9280
67 Fred with Bumper Stickers
68 Dudley Spare (Octane Gain Pitty) 1244-9287-7023-2940
69 Ron Hover 1843-6304-8244-2670
70 Sally with Cone
71 Dexter Hoover (Yellow Flag) 6655-6901-2472-4060
72 Edwin Kranks 7468-0011-0209-7330
73 Impound Lightning McQueen 1311-3846-1828-2310
74 Tank Coat Pitty 6835-8801-5520-9450
75 Impound Boost 7808-9554-2353-3910
77 Chief RPM 6047-8871-4088-4990
78 Timothy Twostroke
79 Trunk Fresh Pitty 7210-1031-1786-0850
80 Impound Snot Rod 4005-0331-9595-0090
81 Greta 4415-2307-5895-3830
82 Race Damaged King 6852-8577-3361-1010
83 Easy Idle Pitty 1826-9791-8638-5870
84 Impound DJ 3198-1706-7356-7800
85 Hank Halloween Murphy 7855-1623-4114-7660
86 Chuck Manifold 3829-6103-4355-6850
87 Impound Wingo 8239-3117-2769-5160
88 Tumbleweed McQueen 4532-8676-3094-3650
90 Chuki - CHASE
91 Milton Calypeer
92 N2O Cola Pitty
93 Todd
94 Ferrari F430 - CHASE
95 Patti
96 Vitoline Pitty
97 Mario Andretti - CHASE
98 Costanzo Della Corsa
99 Blowing Bubbles Mater
100 Saluting Sarge - CHASE
101 The King with Piston Cup
102 Dinoco McQueen with Piston Cup
103 Skip Ricter
104 Chick with Piston Cup
105 Mood Springs Pitty
106 Polly Puddlejumper
107 Muddy McQueen
108 Mini
109 Night Vision Lightning McQueen 9739-6932-2443-0080
110 Whitewalls Lightning McQueen 5165-3804-8209-6220
111 Rescue Squad Mater
112 Burnt Lightning McQueen
113 Dr. Mater
114 Nurse Mia
115 Nurse Tia
H1 Mack Hauler 5722-8891-5095-8500
H2 Gray Hauler 8798-2425-7083-2370
H3 Chick Hicks Hauler 5909-6841-0018-8310
H4 Octane Gain Hauler 9976-1299-2394-7150
H5 Jerry Recycled Batteries 6862-6108-4070-4290
H6 Leak Less Hauler 4566-8320-2879-5030
H7 Gil
H8 Nitroade Hauler
H9 Trunk Fresh Hauler
H10 No Stall Hauler
H11 RPM Hauler
H12 Shiny Wax Hauler
M1 Lightning Storm McQueen 7598-9524-0096-3750
M2 Marco 6454-1824-4600-2960
M3 Mack Semi 1205-2651-0151-1030
M4 Al Loft the Lightyear Blimp 1735-3057-5819-3130
M5 Dinoco Helicopter 9021-6819-3925-1720
M6 Barney Stormin 7523-8524-1771-1160
M7 Dustin Mellows 9158-6035-5878-2480
M8 Chick Hicks Semi 6493-8504-2302-3100
M9 Elvis RV
M10 Gray Semi 9205-8628-2433-9420
M11 Hummer Sven
M12 RPM Semi
M13 Frank
M14 No Stall Semi
M15 High'N'Low Ramone
M16 Octane Gain Semi
L01 Chick Hicks Launcher 7598-0968-3496-1320
L02 Vitoline Launcher 2522-6115-5284-9410
L03 Tank Coat Launcher 1851-9096-5281-7990
L04 Shifty Drug Launcher 1057-7724-7715-7410
Post new ones here and I will verify/add... thanks! 
PS - Here is takefiveaday.com's post about codes:
http://www.takefiveaday.com/2009/02/03/disney-pixar-cars-worldofcarscom-update-codes-update/
Also, if you look really hard at and angle behind the name plate, you can sometimes read the
code without opening it.
