Recently Stack Overflow has become inundated with inane "plz send teh codez" style questions from users who clearly have little interest in anything other than being given "codes" which they can copy and paste into their solution.
These questions seriously degrade Stack Overflow by making the signal-to-noise ratio almost unbearable for regular users, and you only have to look at the MSDN forums to see that it will only get worse in time.
Fortunately many of these questions are trivial to identify algorithmically by containing words such as "plz" and "codes" in either the title or body, or excessive repetition of punctuation such as three or more exclamation or question marks in a row.
It would be very useful to have a filter where we can enter keywords, and any questions containing these are simply not returned. They used to be manageable enough to vote down and close, but now it's getting too much and I simply don't want to see them. I suspect this is the case for the majority of other users who have a genuine interest in development and learning.
On one hand I can see why people might reject this suggestion, because then there would be fewer 'decent' users around to down-vote and close these questions. However, if the signal-to-noise ratio keeps decreasing then I suspect that the number of 'decent' users will decrease anyway, so it's probably better to keep them (us?) around by allowing us to ignore the rubbish.