Fresca was a great grapefruity soda, though it's been practically impossible to find anymore for me... I know about a year ago they rolled out different flavors of it (black cherry, peach, some others) which were god awful, so maybe they just gave up on the brand altogether... No idea if it was the same as citra in the beginning, but the mentions of it reminded me of Fresca.
Sierra Mist Cranberry Splash, the recently departed, I quite miss, and hope they bring back for next xmas. I hate Sierra Mist, but man oh man, that Cranberry Splash was awesome.
Pepsi Blue was great. I remember loving crystal pepsi as well, but am unsure if I'd love it the way I did before because it's been so long.
Mt Dew Pitch Black, both the sour reincarnation and the original, although who knows if it'll come back on another halloween.
Jones has a ton of discontinued or hard to find ones I loved. Pink, Chocolate Fudge, the Cherry Pie one in last year's dessert pack, Candy Corn, Caramel Apple (I've not tried Love Potion #6 but want to and it'll surely be in all the discount bins tomorrow at target and gone by Friday)...