Well, I've written a lot of guides, and I update them occasionally. So how do you know if a guide is up to date? Well, you can double-check the date of the guide you're using with the dates here, which are the dates of the most recent updates for every guide!
Here they are, in alphabetical order:
| Ace Harding: Lost in Las Vegas | 6/9/02 |
| The Adventures of Willy Beamish | 12/10/07 |
| Anticipation | 1/3/03 |
| Athena (full) | 11/17/03 |
| Athena (level one) | 5/27/02 |
| Athena (level two) | 5/27/02 |
| Backgammon | 6/6/04 |
| Barbie (part one) | 10/18/03 |
| Barbie (part two) | 10/18/03 |
| Barbie (part three) | 10/18/03 |
| Big Bird's Hide and Speak | 5/22/03 |
| Big Nose the Caveman | 5/2/03 |
| Bubble Bath Babes | 8/7/02 |
| BurgerTime | 8/5/02 |
| Boku Dracula Kun | 9/13/06 |
| Chaos | 5/5/02 |
| CIMA: The Enemy | 11/28/04 |
| CIMA: The Enemy (Boss FAQ) | 11/28/04 |
| Cult | 11/29/03 |
| Deja Vu | 10/18/03 |
| Deja Vu I and II | 3/8/04 |
| Duck Tales (NES) | 1/2/03 |
| Duck Tales Two (NES) | 9/27/03 |
| Duck Tales Two (Gameboy) | 11/28/03 |
| The Empire Strikes Back | 10/20/02 |
| Final Fantasy Tactics Advance Shop Guide | 10/19/03 |
| Fire Emblem Gaiden | 10/23/07 |
| Fire Emblem Gaiden (Lost Woods Map) | 8/30/03 |
| Fire Emblem Gaiden (Plot Guide) | 11/1/03 |
| Frankenstein | 9/9/02 |
| Hoops | 5/28/02 |
| Indiana Jones and the Last Crusade (Taito) | 3/23/03 |
| Jackie Chan's Action Kung Fu | 7/30/02 |
| Jungle Book | 5/18/02 |
| King of Kings | 7/13/02 |
| Krusty's Funhouse | 5/21/04 |
| Kwirk | 8/16/04 |
| Legend of Zelda: Oracle of Ages Quote FAQ | 10/16/02 |
| Legend of Zelda: Oracle of Seasons Quote FAQ | 10/28/02 |
| Legend of Zelda: Twilight Princess | 1/3/08 |
| M.C. Kids (level one) | 4/10/02 |
| M.C. Kids (full) | 2/15/02 |
| Major League Baseball | 8/1/02 |
| Mario Bros. | 9/11/03 |
| Mario Bros. (E-reader version) | 9/19/03 |
| Mickey Mousecapades | 1/6/04 |
| Mickey's Safari in Letterland | 5/20/03 |
| Monopoly | 8/9/02 |
| Museum Madness | 5/7/02 |
| Nancy Drew: Curse of Blackmoor Manor | 4/29/06 |
| Nancy Drew: Last Train to Blue Moon Canyon | 6/26/06 |
| Nancy Drew: Stay Tuned for Danger | 3/1/06 |
| Nancy Drew: The Haunted Carousel | 10/26/05 |
| Nancy Drew: The Final Scene | 7/5/05 |
| Nancy Drew: Treasure in a Royal Tower | 4/8/06 |
| Nightshade | 9/6/04 |
| NHL Hitz 2003 | 11/6/02 |
| Pajama Sam: No Need to Hide When It's Dark Outside | 8/23/04 |
| Pajama Sam 2: Thunder and Lightning Aren't So Frightening | 8/25/04 |
| Pajama Sam 3: You Are What You Eat From Your Head To Your Feet | 10/5/04 |
| Pajama Sam 4: Life is Rough When You Lose Your Stuff | 8/30/04 |
| Peek A Boo Poker | 6/12/02 |
| Prince of Persia: Sands of Time | 9/7/04 |
| Prince of Persia: Sands of Time: GBA/GCN Connectivity Guide | 9/10/04 |
| Prince of Persia: Warrior Within | 8/22/06 |
| Putt-Putt Goes to the Moon | 11/30/04 |
| Putt-Putt Joins the Circus | 9/1/04 |
| Putt-Putt Joins the Parade | 4/2/05 |
| Putt-Putt Saves the Zoo | 7/8/05 |
| Putt-Putt Travels Through Time | 7/1/04 |
| Rampage (killed 12/15/03) | 2/16/04 |
| Recca | 7/9/02 |
| Rollergames | 7/7/02 |
| Sesame Street: ABC | 5/22/03 |
| Side Pocket | 6/9/02 |
| Spy Fox: Operation Ozone | 6/20/06 |
| Super Mario Brothers 2 | 10/10/07 |
| Super Solver's Gizmos and Gadgets: Best Parts Guide | 7/12/05 |
| Taipei | 6/3/02 |
| Tiny Toon Adventures | 9/12/05 |
| Tiny Toon Adventures 2 | 7/4/02 |
| Ultimate Brain Games | 4/30/04 |
| Wagyan Land | 6/28/02 |
| Wheel of Fortune | 4/8/04 |
| Wheel of Fortune (Gameboy version) | 4/30/04 |
| Where in Time is Carmen Sandiego? | 6/25/02 |