10. Demon Attack. This is one of the last shmups that I got for my 2600. It had sparse graphics, but excellent animation. The demons looked like winged birds and when you'd shoot them, they would break into two smaller/faster demons. I even heard that there was a bug in this game that would cause it to freeze when you reached a certain score -- probably the max integer 32767 or along those lines... But I wasn't good enough to crash to score counter.

9. River Raid. This game is cool. But I never really cared about the scoring system, I always just tried to get as far up the river that I could. But, hey, I still play this on my PS2.
8. Asteroids. It was a cute little conversion. To make up for the lack of sharp vector graphics, Atari made this version in color. And despite the limitations of the 2600, the gameplay was spot on!
7. Berzerk. A friend of mine got this game and I'd ride my bike to his house just to play it. This is one of the few games that looked just as good on the 2600 as it did in the arcade. One of the neat things about it was that the bad guy was this unstoppable happy face. The guy that made this game was a real sicko!
6. Atlantis. This was one of the best looking shmups on the 2600. My neighbor got this game for Christmas and when I first saw it, I thought that he got a Colecovision. Not much to the gameplay. It plays like a fixed version of Missile Command.
5. Missile Command. This arcade game was located at my local Pizza Hut, so when I got my 2600, I had to get it. It was a bit strange using the joystick instead of a trackball, but it worked. And this is another game that looks just as good on the 2600 as it did in the arcade.
4. Yars' Revenge. Oh man! This game is sweet. It's supposed to be a take off of Star Castle, but it ended up being really different in the end. You're supposed to shoot some bad guy behind a shield and in order to do that, you have to shoot or eat the shield. Yeah, you can eat it. And the bad guy can shoot back. Some people say that this game is so different that it's not really a shmup but an action game. But I think that the ship's eating ability is just a cool addition to your arsonal and it just makes it stand out as one of the better 2600 shmups.
3. Spider Fighter. This game was the first manic shooter that I can remember. You've got a rapid firing gun pod at the bottom of the screen and there's these spiders trying to steal your fruit. I can remember my favorite saying when I was playing it... "OMG! OMG! OMG! OMG! Yiii! Take that! No!!!! Yes! Whaa!! OMG! OMG! OMG!" Yeah, it was great fun!
2. Megamania. This is a game that a drug addict would have nightmares about. It's a manic shooter where you're under a constant attack from tires, dice, hamburgers, bow ties, ect, ect. This game was my first party game!!!
1. Vanguard. This is shmuping goodness at it's best, and Atari did an excellent job at porting it to the 2600. This game is one of the few that has both vertical and horizontal levels. And your ship has the ability to fire in all 4 directions -- just move in the direction you want to fire and hit fire. I can remember rolling the stick in circles so I could send a stream of firepower in all directions - a very effective tactic! Oh... did I mention that it even has a nifty little end boss. Yeah, it does! This is the first game that I remember playing that actually had an end boss! All in all, this is the best shmup that the 2600 has to offer.