Amazon Prime also has all seasons of TNG (and all the other ST series), costs less per year than Netflix, and includes free two-day shipping on all meatspace purchases. The Amazon Prime streaming collection is currently smaller than Netflix, but it's growing rapidly and from the perspective of a sci-fi fan it's almost as complete. If there are only a few shows you want that Amazon Prime lacks, it might actually be cheaper in the long run to buy those shows from Amazon, rather than pay netflix's higher price indefinitely.
I am in the process of cutting the cable, for which purpose I put together an htpc using xbmc on top of xubuntu to watch hulu, Amazon instant videos, and files ripped from my collection of DVDs. I was originally planning to supplement this with netflix on my Wii, but actually dropped the idea: most of my favorite sci-fi shows are free with Amazon Prime (which I already have anyway), and in the long run it's cheaper to buy seasons of my daughter's children's shows (Dora, Backyardigans, etc.) from Amazon rather than pay for Netflix indefinitely. Also, I can watch the Amazon shows on my htpc so I don't have to switch to the Wii to play one of my daughter's shows.