One thing that REALLY helped me with that regard was John Nunns excellection "1001 Deadly Checkmates".
All the mates are in sections, and graded from 1 to 5 on difficulty.
which is brilliant, because the Grade 1 mates are usually just 2 moves to mate or so, Grade 2 is 3 moves etc etc.
Because they're laid out in sections, the Grade 1 moves get you used to the mating idea, then the Grade 2's get you to look for the same ideas, but 3 moves later, and on and on up to the 5 puzzles.
Brilliant book. I've knocked out a couple of mates in 5 recently that I would never have seen before reading that book.
Can anyone recommend some resources (preferably free, but not required) to help me look ahead more in my games. I seem to be limited to like 2 moves and even then I'm shaky at best. I have chessmaster XI and just started using it. Any other suggestions? God bless! Neil