Data is actually one of my favourite ST characters and I was annoyed at having to wait this long for him! (Take note TinyCo ;))
Anyway here is the guide for his unlock!
Emotion Chip – 25
– Blow up Romulan War Birds
Anti-Virus Software – 28
– Make Peter Press all the Buttons
– Make Crusher Crush It
– Make Herbert Take Gross Old Man Bath
Cat Food – 20
– Make Riker Seduce Alien Ladies
– Make Locutus Drink Borg Tea
– Get from Borg Cube
Floppy Disk – 50
– Get By Clearing Borg
Get 50 clams if you have: Riker, Geordi, Troi, Crusher and Data!