The Legend of Zelda -Nes 1987
The one that started it all and definatly one of the harder ones!
Sold-Over 6.5 million copies.

The Adventure of Link (Zelda 2) -Nes 1988
This game is quite differant than the others - it has a seperate side on view for attacking enemies.
Sold - Over4.5 million copies

A Link to the past (Zelda 3) -Snes 1992
Returned to the same approach as Zelda1 but bigger and better. Another defining moment in the Zelda series.
Sold - Over 4.5 million

Link's Awakening (Zelda 4)(Zelda 4 DX) -Gb  1993
Was easily the best RPG game on gameboy for years until Pokemon came out - the colour version came out and it regained it's crown. The Rpg section is now starting to get filled with execellent Zelda and Pokemon games- and Nintendo are the creaters of both series. 
Sold - n/a

Ocarina of Time  (Zelda 3) -N64
Some people say Zelda3 is the best whilst others say that it has to be Zelda 64, either way Zelda 64 was a truely revolutionary game creating yet another new niche in the market - Behold 3-D Real-time, action RPG's -Gaming is sweet! The most immersive game I had ever played until Majora's Mask.

Mask of Majora -N64
Carries on  just where Zelda 64 left off! Doesn't look like anything really new but is packing Zelda's winning gameplay and some all new features, prepare to be immersed again!

Mysterious Seed -Gbc
Unlike the above this is being developed by Capcom but the gameplay is supposed to be mainly the same as Zelda 4.

Not sure of the title -Gbc

Zelda's Adventure -Phillips CDI
Faces of evil -Phillips CDI
The wand of Gamelon -Phillips CDI
I know that at least two of these games were 2-D platform/Adventure games, needless to say, since Nintendo didn't make them, they wern't all too hot!

Zelda Game and watch
One of those cool double screened, foldy portable Nintendo LCD things. It also tells the time!

Zelda Watch
Play a game of Zelda on your watch! Cool! I had one of these years ago, but it went "missing" the day I got it and I have never found another! I remember it being pretty cool!