Day of the Triffids is good SF...although it doesn't follow the excellent book very well! John Wynham had another book made into a movie. It was called the Midwich Cuckoos, which was made into Children of the Damned (made twice). I saw the original as a kid and the images from it stuck with me for some reason.
Day of the Triffids was also made into a British series which follows the book very faithfully...good to see as well...
Wasn't there also one called "Village of the Damned".
I remember "Children of the Damned" and those kids were creepy.
I heard that the BBC version of Day of the Triffids is excellent-much better than the 1963 movie, in fact. The BBC has made lots of excellent SF productions,with the Quatermass serials being the best and best known but sadly, many of them are now forever lost.