Adding to the percussion tips, your notation must be clear and consistent. I gave a seminar on writing for percussion once, and the mnemonic I came up with is "Hit what, with what, move to what." In other words, for any note, you should label the instrument being played, what it is being played with, and to what instrument the player will move to next. Many common instruments will have a "default" beater (such as sticks for snare drum or bass beater for bass drum), and as such the second step isn't always necessary, but even for instruments like glockenspiel, suspended cymbal, and marimba, you should specify the mallet you want used. The caveat to this is that most percussionists have spent years in band class playing music written by mediocre composers that had no idea what they were doing when it came to percussion, and have developed the skill known as "figure out how to make vague, impossible stuff work," so if you forget to say that the suspended cymbal part should be played with medium yarn mallets, the player will generally try a few things out and go with what he or she feels works best.
Speaking of cymbals reminds me, you should err on the side of specificity. One of the most annoying things is to see some whole note in the middle of the staff with "cymbal" written over it, because I have no idea what type of cymbal, what mallet I should be playing it with, whether I'm supposed to sustain it for a whole note or hit it once, whether I should let it ring or choke it, etc. etc. Be clear with what you write.
Score for players, not instruments. I've seen scores that were half percussion staves, because the composer wrote separate staves for wood block, triangle, cymbal, bass drum, snare drum, etc. even though, in performance, those parts had to be recombined into two or three players. Sort out the parts by person, give each just one staff, and notate instrument changes with words (e.g. "to wood block"). This removes the superfluous logistics step of laying out all the parts, then re-writing them for the performing forces available.