I havn't watched to many scfi tv shows.
But as far as movies go:
Phillip k. Dick has never had a truely horrid film adaptation.
Screamers, A Scanner Darkly, Blade Runner and Minority Report are all good. Total Recall is good, if you can get past the Arnie factor. I haven't seen Imposter yet, though. (i think i'm missing one)
If you have not seen A Scanner Darkly, go now, and get it.
Gibsons one cyber punk adaptation, Johny Menomic is really good.
One weird scfi movie that I really love that kinda dropped from radar is Strange Days. Its very influanced by Gibsons theme of 'cyber punk'. The Matrix also borrows heavily from Gibson.
The two traditional scfi movie sagas, Dune and Star Wars, I lump together as being Hurbert adaptations. (both Dune movies are good in there own ways, I say skip the first two 'episodes' of sttar wars, meh on the third and your not a real american if you have failed to see 4-6)
The last real original, which was supposed to be a saga space odyssy was Cronicles of Riddick, which I was disapointed in its failure to be completed. Pitch Black (which was the introduction of Riddick was then billed as the prequel) is an exellent stand alone.