1.VVVVVV
2.Shantae Risky's Revenge
3.Earthworm Jim
4-Cave Story(i don't have it on dsiware,but i have the wiiware version which is pretty much the same )
5-Go series Undead Storm

In no specific order...

1. Zelda: Four Swords
2. Mario Vs. DK: MMA
3. Mighty Flip Champs
4. Antipole
5. Pop Island/Pop Island: Paperfield
6. Aura Aura Climber
7. Dark Void Zero
8. Shantae: Risky's Revenge
9. Escapee Go!
10. PICTOBiTS

@IAmNotWill, I didn't even realize, "TLoZ: Four Swords Adventure," was available on the eShop as DSiWare. I'll have to look into that. What search terms would I need to type in to locate it, because I didn't happen to see it anywhere on the eShop.

Four Swords is DSiWare, but you can't buy it. It was only in the shop as a freebie and now it's gone.

1. Zelda: Four Swords
2. Ferrari GT
3. Elite Forces Unit 77
4. Inchworm Animation
5. Undead Storm

I wish I could get in on the Multiplayer action on these though...and I wish Undead Storm had a Survival Mode. Ah well, at least I have CoD:BO Zombies for DS.

It was free up until February. Nintendo removed it since then. Sucks that they didn't at least put a price tag on it or something.

I have 8 dsiware games, including: Mighty Flip Champs, Mighty Milky Way, Plants vs Zombies, Cut the Rope, Flight Control, Zelda: 4 Swords Anniversary, Mario vs Donkey Kong & Shantae: Riskys Revenge.
My top 5 from this list are:
1. Shantae
2. Mighty Flip Champs
3. Mario vs Donkey Kong
4. Mighty Milky Way
5. Plants vs Zombies

Even though this isn't the recommendation thread, are there any other games that I should have, cos I've been thinking about getting some more recently.

5. Art Style Code
4. 5in1 Solitaire - My wife and I love this game. We're often playing it (almost 40 hours gameplay for only 2 euros)
3. Art Style - Intersect
2. Wakugumi
1. Suujin Taisen (Battle of numbers)

1&2 are from Mitchell Corporation (Actionloop Magnetica game) and they make really great games

1 Shantae
2 LoZ Four Swords
3 Cave Story
4 Mighty Flip Champs
5 MvD Minis march again

I own: Oregon Trail, My Exotic Farm, Brain age espress math, brain age express arts and letters, bird and beans (pyoro), candle route, pop island paperfield, aura-aura climber, photo clock, zelda: four swords, flipnote studio, web browser, and rytmik rock edition.
Top 5:

1. Rytmik Rock Edition
2. Aura-aura climber
3. Pop Island Paperfield
4. Candle Route
5. Bird and Beans (pyoro)

EDIT: Bird and beans is 4, and Candle Route is 5.

1. Petit Computer
2. Art Style Boxlife
3. Tetris Party Live
4. Aura Aura Climber
5. Fieldrunners

My top 5 are
1. Art Syle: Zengage
2. Shantae: Risky's Revenge
3. X-scape
4. Candle Route
5. Robot Rescue 2
I feel like i should put a 6-10 too because i have a lot of awesome games
6. Dark Void Zero
7. Art Style Base 10
8. Paper Airplane Chase
9. Castle Conquetor: Heroes
10. Cave Story

1-6. X-Scape. Seriously. Really, damn serious. Anyone saying "all the DSiWare suck" or "the rest aren't worth points" need to buy this damn game. It's the only reason I wish the DSi was fully hacked, so I could extract the soundtrack from this beautiful game.
7. Mighty Flip Champs. First game I downloaded, and I still love the game itself.
8. AlphaBounce. Some thought it was repetitive, but the loads of options for customization and RPG elements made it feel like a grind only in the beginning.
9. Flametail. I don't know why I love this so much, but I do. Well, except for the BRILLIANT soundtrack. Again, developers, release your damn soundtracks, especially Q-Games.
10. Glow Artisan. I don't really know what to put here, but this got here solely due to the lasting appeal and customization. This also needs a 3DS rerelease, if only because the level editor makes me wish it was a giant hit.

Honorable mentions: 99Bullets: Great concept, good art style, addictive gameplay, super tight execution, fun bosses, spacey music, SO MUCH MISSED POTENTIAL. Seriously, it felt like the greatest concept demo ever.
Shantae: This probably ranks pretty high, but I haven't played in a while, and I remember a few parts leaving me frustrated.
Pop+ Solo: Stress relief
The remainder of the Q-Games trilogy, Starship Defense and Trajectile. All 3 are huge games with brilliant art styles and great soundtracks, though X-Scape is in another league.
Cave Story: Lazy port. A damn fine lazy port.

1. Kubos - incredibly addictive puzzler. Brilliant aesthetic.
2. Spin Sin - wildly entertaining and offbeat action game, and incredibly easy to play over, and over, and over again.
3. Starship Defence - the best tower defence game ever produced.
4. Dragon Quest Battles - or whatever it's called. Great multiplayer Chess-style strategy game
5. Flight Control - the stylus really helps this game over the iPhone and console versions.

5. Asphalt 4
4. Bomberman Live
3. Spotto
2. 4 Swords
1. Castle of Magic
i have plenty other games just none worth it -_-

1. Spotto
2. Chuck E. Cheese Arcade Room
3. Chuck E. Cheese Alien Defense Force
4. Hello Kids Vol 1 - Coloring & Painting
5. Lola's Fruit Shop Sudoku

Happy Gaming! (^_^)

I have: Go! Go! Kokopolo, Nintendo DSi Tunner, Bird and Beans, Animal Boxing, Petit Computer and Inchworms.

1. Go! Go! Kokopolo! (S2)
2. Petit Computer (S2)
3. Inchworms Animation
4. Need for Speed Nitro-X
5. Animal Boxing

1. Flipnote Studio
2. Shantae Risky's Revenge
3. Mighty Flip Champs/Mighty Milky Way
4. Pictobits
5. Pop Island

The reason I put Mighty Flip Champs and Mighty Milky Way at number 3 is because there both apart of the mighty series and that wayforwards games would have taken most of the spots XD

Also if you know who I am on Flipnote Hatena, then you'll get why Flipnote Studio is number one